A character with a Sugar and Ice Personality has two distinct sides, one cold and distant, the other warmer and open. In some cases the differences between the two aspects of the character's personality are so radical as to be shocking coming from the same person. Often this extreme polarity is due to some form of traumatic experience or social awkwardness, though occasionally it might resemble a full blown Split Personality or one-man Red Oni, Blue Oni. Their dual nature could also simply be the way they are, with no explanation otherwise given.
The cold side can have a few different variants, though the Ice Queen or Ice King is probably the most common, mixing aloofness and distance with a certain harshness and lack of sympathy. Another manifestation of this side is as The Stoic, being simply unemotional and unresponsive rather than harsh. Occasionally this cold part of their personality may resemble a full-on Emotionless Girl, or include the sharp tongued aspects of The Snark Knight.
The warm side, on the other hand, is usually quite kind, open and emotive. Some variations can be very animated when in the right situation, though others may be Shrinking Violets, uncertain how to interact with others when not acting tough. Even the shy-types, however, usually wear at least a small smile or sport a Luminescent Blush to indicate that they are far more emotionally reactive than their cold side.
Usually, their cold side is the one everyone is used to, with the warmer side only glimpsed in response to specific triggers. In many cases, all it takes is getting to know the person before the warm side begins to make an appearance.
More rarely, the frosty side is the seldom seen aspect and is only evoked when they are confronted by something they find annoying or tedious. Often this is a bumbling Love Interest who doesn't know what he's done wrong. While there are occasions where the cold side is a mask, this by no means describes all examples. In such cases both sides are genuine aspects of their personality, the character is simply compartmentalized to a much greater degree than most people are.
Compare Not So Stoic and Stoic Woobie. Sometimes related to Beneath the Mask. A Sister Trope to Tsundere (which is basically "Sugar and Fire"). Anime fandom refers to this character as a kuudere (a portmanteau of kuuru, "cool", and deredere, "lovestruck"). Rei Ayanami Expy is a specific subtrope with a particular set of characteristics. In a Four-Temperament Ensemble, this is a typical trait of the Melancholic, though it can occasionally apply to the other temperaments. Not to be confused with An Ice Person.
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Anime and Manga
While Anna Kyoyama from Shaman King may seem like a hard training thoughtless bitch at first, she undoubtedly has her kinder and more caring side to her that begins showing later on in the series.
Angel from Angel Beats! seems like a straight Emotionless Girl in the beginning, but starts to show flickers of emotion and humanity starting in Episode 5, when the protagonist speaks to her and learns her real name. This is a weird case because she's the antagonist ...not. After the whole Naoi business she's a straight ally to Otonashi, and, eventually, all the SSS. In the final episode, she drops the cold facade entirely now that almost the entire cast has moved on. She spends the episode smiling, humming and singing about tofu, and being the most adorable thing ever.
Shinku acts this way towards Jun. She treats him coldly and like a servant. However, she shows that she does care deeply about him. Her behavior overlaps with Tsundere, as she also constantly abuses him verbally and physically.
Souseiseki acts serious, levelheaded and unattached in order to fight in the Alice Game as she believes it's part of her duty as a Rozen Maiden. However, she's shown to be very caring and kind to her twin sister Suiseiseki, the only doll she doesn't want to fight.
Tomoe Yukishiro from Rurouni Kenshin. Stoic and aloof, giving the impression of being an Emotionless Girl. Eventually, it's revealed that Tomoe is a very emotional person, hiding great sadness over her fiance's death at Kenshin's hands. At the end, she's able to show her warm side to Kenshin before sacrificing herself to save him.
Hikitsu the Genbu Warrior from the Fushigi Yuugi series scares off those who are first meeting him because of his harsh and cold persona, but those who befriend him and gain his trust discover that he is actually a very nice guy.
In Karakuri Circus, Shirogane initially comes off as somewhat haughty and cold, but later her inherent sweetness shows through.
Itachi acts emotionless and blank whenever we see him after the Uchiha Massacre, and he's polite but distant in interacting with everyone. Then we see him in his past with Sasuke, and he's rather...sweet with his little brother. Later it's shown that he only let out his real personality whenever he was alone with his brother or thinking about his brother.
Neji has a similar personality now after Naruto's Therapy no Jutsu. He's still rather stiff and stoic in general, but now his repressed affection for Hinata has come back and Neji has become super protective of his cousin, partially as an atonement for the grief he had caused her earlier.
Lain from Serial Experiments Lain, one of the contestants for the role of creepiest Emotionless Girl, MindRapesherself (or something...) and the fašade shatters completely. Since Lain is the viewpoint character for most of the series, the effect isn't quite as strong as it could be; the viewers get frontline seats to her internal turmoil, and she's far less aloof when she's alone with her thoughts, which is quite often.
Karuta from Inu X Boku SS is a very cute and sweet girl, but she's usually very stoic and quiet.
Eucliwood "Eu" Hellscythe from Is This a Zombie? may appear to be very cold and expressionless, but this is a facade she's forced to put on because if she expresses strong emotions her powers will go out of control. In the rare occassions she lets her emotions out, she's very cute and sweet.
Yue Ayase: While usually the voice of reason, being part of a Love Triangle with her best friend causes her to break down and reveal a very warm side.
Setsuna is also an example: she strives to maintain her cold, levelheaded swordswoman persona, but what she really wants more than anything is to overcome her weaknesses so that she will be capable of protecting Konoka. Notably, Konoka doesn't really care for the whole "emotionless, intellectual warrior" thing, and actively tries bring out Setsuna's warmer side. It works.
Princess Arika is another example. Driven by The Chains of Commanding, she shows herself as an extremely cold and cool-headed princess, when she's actually an emotional and compassionate woman. We see flashes of Tsundere when Nagi provokes her, though.
Ai Enma from Hell Girl. She's forced to repress her emotions in order to carry out her job as the Hell Girl, but she allows herself to show a more caring and compassionate side around her True Companions. She also can show sympathy to her clients.
Yuki Nagato from Haruhi Suzumiya. Although she appears to be an Emotionless Girl, she's actually a very kind and caring girl. She was just ill-equipped by her creator to actually express emotions.
Sakaki from Azumanga Daioh, natch. So, so very compassionate and cute on the inside, but outside, she looks like a cold, tough Huge Schoolgirl. She manages to break out of her cold, reticent shell once she finally manages to pet a cat without getting hurt. A Shrinking Violet, but only because she laments never being cute as a child. Her coldness isn't a fašade she's putting up to fool everyone, but something she does completely by accident.
For all of her Yandereness, Lucy from Elfen Lied. She's cold and deeply cynical, but only because she's been hurt so badly every time she lets her guard down. She may slaughter humans without hesitation or remorse, but her capacity for love is still very real.
Amu Hinamori, the main character, is known as the "cool and spicy" girl at school because of her unique fashion style and her blunt attitude. However, she actually just wants to be normal and girly, and it's actually because she's shy that she puts on a cool girl act.
Rima. First impressions: dainty, spoiled, yet cold. She's really actually a sweet girl and just needed time to warm up to Amu and her friends. Plus, as serious as Rima is, her "would-be self" is a clown, because she wants to make people laugh.
NoŰl Kannagi from So Ra No Wo To shows little emotion and says very little; however, she's severely emotionally scarred by her part in the Invisible Reaper, warms to Kanata and Kureha inside of a few months of Kanata's arrival, and wants to become 'a lovely wife'.
Austria, too. Seen in the strip right after the "Chibitalia" chapter, where much to Hungary's shock he takes up the rest of Chibitalia's daily chores for once. Also seen in the Valentines strip, when Germany pointed out that Austria would get lost if he went out to purchase a present for his ex-wife Hungary, he opted to make her a gift and ask someone else to give it to her. She was very much "aaaawwww" when she found out.
Iceland was mentioned to be Hot-Blooded inside and keeping it cool outside. This was thought to be an Informed Ability...but he was shown in one of the Nordic strips being cool in the beginning and almost losing it at the end.
Japan shows little emotion on his face, remains relatively stoiceven when angry, and is the epitome of Inscrutable Oriental overall...but he genuinely cares for his friends and tries his best to get along with them even when they confuse or baffle him, and you get the feeling that his excessive politeness and seeming indifference at times are more a product of him not quite knowing how to deal with others with personalities vastly different from his own than him being condescending or disdainful toward them. He keeps close relationships with both America, in spite of his often patience-testingpersonality, and Greece, with whom he shares a love of cats.
Dark Magical Girl Fate, particularly during season 1. She initially seems cold and unfeeling, solely focused on pleasing her mother, but shows a kinder and gentler side over time. Later seasons has her warm side coming out more, with the cool part being reserved for combat.
Lady of War and Fate's Worthy Opponent Signum from the second season onwards qualifies, too. After centuries in service of selfish, destructive owners of the Book of Darkness, she developed a perfect Stoic personality...then along comes Hayate, who wastes no time adopting the Wolkenritter and letting them know the warmth of a family for the first time. Her facade melts away. Then comes the third season and her Unison with Agito, who is a literal fire elemental...
Boa Hancock gives a cold Jerkass Fašade to her people and acts cruelly to her enemies, but becomes as soft as a marshmallow whenever Luffy's around.
Nico Robin. She's usually calmly cheerful as opposed to showing no emotion at all, but she's still very cool-headed and keeps herself distant from others out of fear that they will eventually betray her. The Straw Hats are the only ones who have earned her trust and are able to see her open and caring side.
The Prince of Tennis: Tezuka had kept a cool, neutral face throughout the whole series, but when Seigaku won the Nationals, he is revealed to have a very nice smile. You know it's a big deal when Inui thought it was necessary to actually catch it on film.
Yuki Eiri from Gravitation is cold and aloof because of a troubled past, but gradually warms up to his love interest Shuichi, even breaking down in tears for the first time in six years in front of him. This is much more true for the anime, where he rarely (if ever) loses his cool, as opposed to the manga, where he seems to lose his temper with Shuichi more easily.
Android 18 from Dragon Ball Z is very cold unless she's with Krillin and their daughter, in which case she drops her coldness and shows her warmer side.
Rei Ayanami from Neon Genesis Evangelion is a mix of this and Defrosting Ice Queen. In the beginning, she could be mistaken for an Emotionless Girl, aside from her warmth towards Gendo. She lights up when he speaks to her, and smiles sweetly when she looks at his glasses. She later warms up to Shinji, especially in the manga, and dear God can she be gooey-sweet over him. Her affection for him grows to the point that even when she becomes The End of the World as We Know It (this after having died and forgotten her experiences with him), she still cares for him, given that it was his anguish over Asuka's gruesome death that prompted her to finally betray Gendo and put Instrumentality in Shinji's hands...
Setsuna Meiou, a.k.a. Sailor Pluto: she gets mistaken for an Emotionless Girl at first, but it turns out that she's just sad and lonely, having to guard the time gate while watching her life go by. It makes sense that she is guarded, because she is a Sailor Soldier first (installed at the gate as a very young child) and has to come up with a civilian identity later.
Also, Michiru Kaiou, a.k.a. Sailor Neptune. She is very calm, cool and collected, as well as extremely dedicated to her Senshi mission...but she can also be very gentle to those she loves (if in a very princess-like way, befitting an Ojou like her), particularly her girlfriend, Haruka.
Rei Hino (Sailor Mars) is similarly stand-offish, but kind in the original manga and live action adaptation. She acts more like a Tsundere in the anime.
Karl-Heinz Schneider from Captain Tsubasa looks cool, professional and proud, but, holy shit, he's loving towards his parents and his little sister.
Yuuko Ichihara from XXX Holic: for a large portion of the series, she appears to be a rather cold-hearted, calm and calculating woman that seems pretty cynical and grants people's wishes with rather sinister consequences. Later, however, she starts showing her warm, affectionate side towards Watanuki...which is made all the more obvious in the touching scene in the manga where she disappears after telling Watanuki that her only wish is for him to continue living, and in turn he swears to wait for her forever.
Mirielle of Noir is, for most of the series, a BadassAction Girl assassin who only occasionally lets her soft side show, but late in the show when she finds Kirika's heartfelt note she starts crying.
Fiore from Chrono Crusade comes across this way because of her outward Emotionless Girl personality. She believes herself to be completely without emotions and can often be blunt (in a very polite sort of way), but when Joshua gets into a fight she later admits with tears in her eyes that she was "so worried", and she goes out of her way to make sure all of the Sinners eat their veggies.
Asuka, the main character of Otomen, tries his best to act like the pinnacle of stoic manliness, but in reality is enamoured with all things girly and adorable.
Tsukikage Yuri/Cure Moonlight from HeartCatch Pretty Cure! initially acted cold and aloof around her fellow Cures, but showed a more compassionate side to her friend Momoka, her mother, and, on one occasion, a runaway child. She defrosts slightly after joining the team, but still keeps many of her Sugar And Ice aspects.
A literal Ice Princess, Mizore from Rosario + Vampire is very stoic and emotionless when the situation demands it. If she becomes emotional, she either considers you a close friend or you're about to get your ass handed to you.
Trip/Shooti from PokÚmon Best Wishes seems to be a jerkass until you realize that he does have a heart, as revealed in the episodes where he helps Ash move the Venipede to a safer location. The minute Ash tries to congratulate him, Trip instantly avoids eye contact. Later appearances tone down his jerkass attitude until it's completely a Jerkass Fašade stemming from annoyance at Ash more than anything else.
Homura Akemi from Puella Magi Madoka Magica: when we first meet her, she acts quite cold, and is very cynical in regards to being a Magical Girl. But as the series goes on and the Awful Truths about actually being a magical girl come out and we get more emotional reactions from her, it becomes quite clear that she's in this to protect Madoka. And then comes episode 10, where we find out just WHY Homura is this way. DearGod, Homura...
Yue from Magical X Miracle is fairly cold to everyone, even those he cares about, although he goes through times when it looks like he's starting to soften up towards his friends.
Osamu Sugo from Future GPX Cyber Formula is calm, levelheaded and professional most of the time, but acts warm to certain characters, especially Hayato and and his sister Asuka.
In Happy Yarou Wedding, Yuuhi had always been considered to be really cold-hearted by his girlfriends but he was really just afraid of letting people in. The more time he spends with Todou and Shouta, the more his warm side comes through.
The protagonist Heero Yuy is more often credited as The Stoic, but this trope is a better match for him. He never actually denied his emotions; he just tries to keep them in check because being overly emotional on the battlefield can get you killed. At the start of the show he mostly seems to be shouldering the burden of Operation Meteor (and the lives it'll cost) all by himself, but interaction with people like Relena, Duo, and Quatre causes him to accept the idea that he isn't alone.
Heero's teammate Trowa Barton also fits in this mold. Having been raised by mercenaries after the death of his parents and being separated from his older sister, he is very methodic and coolheaded, but he has kept the core of his warm and kind heart intact. Noticeably, he counsels the aforementioned Heero when he's recuperating after destroying his Gundam, and gives a very long speech to Quatre about his gentleness before his Mobile suit blows up and he's rendered with Trauma-Induced Amnesia..
Erza is very serious and stern, especially when she's introduced. However, she's a caring and loyal friend just like everyone in the guild. She also shows a very soft and vulnerable side around Jellal.
Zeref has a personality like this. Though he hasn't been shown acting particularly warm, he has a side to him that's calm and worries about the well being of others, which is how he behaves half the time. The other half of the time he's downright murderous.
Rogue spends most of his time not emoting or expressing interest in anything (other than Gajeel), but when one of his guild members gets kicked out in a way that makes his Exceed companion worry that they may go next, Rogue gets a Pet the Dog moment smiling and assuring Frosch that he'll be there to make sure that doesn't happen.
Sanzo from Saiyuki. You have to be looking really really hard for the sugar parts, because his natural personality is combined with his desire to appear as prickly as possible to make sure no one around him thinks he's gonna protect them (and therefore not getting friends that need protecting). But in his calmer interactions with Goku (when he's not hitting him over the head) he generally gets a little smile on his face. When Goku was a kid and no one was around to catch him he even smiled and commented that Goku's cheeks looked like dumplings. In a more literal sense, he's an ice princess who loves sugary things.
Zazie in Gunnm: Last Order always tries to hide her shy and sensitive nature behind a facade of an always cool and professional soldier, though not always successfully. For example, it didn't take the twins long to notice her admiration of Gally and start teasing her relentlessly.
Kuroh Yatogami, one of the main characters, is a stoic man of few words and a strong sense of duty. He is not fazed at the prospect of killing protagonist Shiro and is initially presented as distant. However, he shows respect to people he trusts and slowly opens up and supports Shiro and Neko.
Reisi Munakata is just as distant as Kuroh and seemingly even colder as an individual, but he genuinely cares about his clan and his old friend, Mikoto. He only shows affection a few times, and it is subtle.
Anti Villains Mutsu and Akitsu, two of the main antagonists from Sekirei. Mutsu is serious and stoic Master Swordsman, while Akitsu is an Emotionless Girl in fitting with her elemental powers. Both are eventually shown to be kind-hearted individuals, utterly devoted to their Jerkass Woobie master, and offering words of sympathy and encouragement to the heroes. One is merely distant because he's the Only Sane Man surrounded by overbearing personalities, while the other is an incredibly tragic Broken Bird.
Eureka from Eureka Seven is like this at the beginning of the series. She switches between being pretty much an Emotionless Girl and a kind girl who is a loving mother to her adopted children. Her warmer personality eventually takes over thanks to the influence of her lover Renton.
Inori Yuzuriha from Guilty Crown is stoic to the point of appearing emotionless, yet she's one of the sweetest and most caring characters in the series.
Ryousuke Takahashi in Initial D. Not so much in the anime where he's always distant, but there is occasionally some emotion shown in the manga.
Fakir in Princess Tutu. Cold and hostile toward a girl named Duck who keeps sticking her nose in his business; sweet and vulnerable around that duck he found in his locker one day. Naturally, he's mortified when he finds out it was the same person.
Ryuko Matoi in Kill la Kill. At the start of the series, she's an aloof drifter driven by stone-cold vengeance for the death of her father. When taken in by Mako and her family, however, she's shown to be as sweet and cheerful as any other ordinary girl. At that point, her personality see-saws between fighting the student council members out for her neck and having lunch with her best friend.
Annie Leonhart is a cold and distant Dark Action Girl, but Eren and Armin both state that she hides her true kindness. Her gentle smile and playful teasing of Eren while teaching him to fight seems to suggest there's some truth to their belief.
Bertolt Hoover is extremely soft-spoken and comes across as being The Stoic due to his tendency to linger silently in the background. But once he begins getting more attention, it becomes clear he's caring but painfully shy. It's justified in an incredibly tragic way, as he doesn't have the luxury of showing his warmer side to people due to being The Mole.
Levi shows hints of this, normally coming across as harsh and cold. But he can show surprising kindness to others, usually in very subtle ways. Considering that he's the World's Strongest Man among a Red Shirt Army, letting people get too close rarely ends well.
Tomoe from Kamisama Kiss is normally rude, self-centered, confrontational, distrustful of others, and a general all-round Jerkass. But once in a while he will show a kinder and gentler side, although it usually takes a lot to get him to show it.
Yako of Yurara is usually aloof, snarky and sometimes downright mean, but when he finds himself alone with the woman he loves he becomes flustered and insecure.
Despite being often pegged as Tsundere, Haruka from Free! shows shades of this with his cool and quiet demeanor. His sugar side mostly arises when in the proximity of large bodies of water.
Cyclops is a male version. He's not especially confident or good at expressing emotion, so he mostly spends his time buried in a pile of paperwork and hiding his crippling self-doubt behind a stone wall. Unfortunately, this also means that he can't explain his actions to the people he leads, so they think he's a Well-Intentioned Extremist. Before her death, Jean Grey, his wife, helped to mediate between Cyclops and the team, but after her death, Cyclops hooked up with Emma, who similarly has trouble relating to people (mostly because she's very blunt and patronizing, rather than being serious and to the point), and watched as over 90 percent of the mutant population was depowered and decimated, followed by two thirds of what's left being slaughtered and him being forced to relocate the X-Men to a military bunker, he basically ends up getting to the point where, whenever there's trouble, he's cold and calculating, moreso than usual, and constantly prepping for war, while retaining his slightly calmer dorky side whenever he has time to be friendly, which sadly became less frequent as time went on until he ends up losing half of his team.
X-23 from the X-Men and X-Force acts cold around other people. Alone, however, she's an emotional wreck who can't reconcile the trauma of her Tykebomb training with her growing desire to be free and express herself. (She was trained all her life to repress feelings and never bond with anyone, so, gradually...she forgot how.) Unfortunately, this is often a Self-Fulfilling Prophecy—she doesn't know how to be social with her peers, so they take her awkward silences to mean that she has no emotions or humanity at all, so they isolate her from the group and call her a 'monster', so she never learns how to relate to other people, so she never learns how to let go of her depression, so she doesn't know how to be social with her peers... (Admittedly, though, it doesn't help that she sees nothing wrong with killing people—something which horrifies her fellow teenagers. Even in her good moments, X-23 looks and speaks in a very creepy way.)
She gets better after breaking out of a mentalEpiphanic Prison and leaving the X-Men. During the journey to find herself that follows, she bonds with Gambit and Jubilee, who also have emotional trauma (What did you expect? It's the Marvel Universe) and understand her Kuudere nature. Her life evens out after that—she's not normal, but she's a healthier example of the trope, and she's slowly making peace with herself.
Batman, believe it or not. Though he never becomes specifically open and warm, his cold and authoritative demeanor works in tandem with a deep compassion and fairheartedness that only reveals itself in certain situations - most often in regards to his adopted "sons" and Alfred.
Taken Up to Eleven on the most recent arc of Batman And Robin: Batman actually tells Damian that he's proud of him, the highest praise he ever gives, and then he hugs him. Manly Tears were shed.
Elijah Snow of Planetary acts cold towards those he doesn't know well. Between that and his powers, he's earned the nickname "Cold Bastard". When Elijah expresses emotion, he's either comfortable with you, using the emotions as a tool, or you've hurt his people...
Gert from Runaways is a Deadpan Snarker who mistrusts adults even more than the rest of the team, which is really saying something. Only the few people who have earned her trust get to know the animal lover and loyal friend hiding behind her prickly exterior.
The Martian Manhunter: aloof and alien on the outside, kind and compassionate on the inside.
He's addicted to Oreos Chocos. That's the first clue. There is no such thing as a genuinely cold, aloof person who compulsively munches on chocolate.
Unintentional Ice Queen Machiko Noguchi from Alien vs. Predator didn't realize that she should have integrated herself into the colonists when she arrived at her new executive job, instead of spending three months hardly communicating with them at all. She's actually rather caring and considerate, but that's not how she presented herself.
Miho from Sin City seems almost completely unemotional, but there have been moments in which she showed genuine affection for a select few people. The prime example is in Family Values, where she lays on Dwight's lap and takes a nap.
Dr. Atsuko Chiba from Paprika. Always cold and serious in the real world, her warm and silly side only comes out when she's in dreamland as Paprika, who's modeled on her secret crush.
In Epic Ronin puts up a cold exterior which he only drops around people he's close to, like Tara.
Film — Live Action
By the end of The Heiress, main character Catherine Sloper has developed this personality (previously being a Shrinking Violet). She is as kind and friendly as she always was with people she likes. With people who get on her bad side, she is a complete Ice Queen.
Sunset Boulevard has a very dark example in Max von Mayerling, Norma's butler and first husband. He's cold, uptight and extremely professional, but he does his best to keep Norma's delusion intact and it's clear that he's still in love with her.
Peggy from The Tales of Alvin Maker is like this when she first appears in the second book. When Taleswapper asks her mother about Peggy, she tells him she's gone too cold for anyone to tolerate her. He carefully refrains from telling her that ice can only be thawed with warmth, and then proceeds to get smiles and laughs from Peggy in private.
Vetinari from Discworld is cynical, sarcastic, pragmatic, and a Manipulative Bastard, but there are a couple of characters he seems quite fond of, and in Unseen Academicals, when he's with characters like Margolotta or Ridcully, with whom he's quite comfortable, he actually gets relaxed enough to make jokes. He also took good care of his dog Wuffles, even when the dog was well into old age. When he died, Vetinari had him buried in a nice spot in the garden, and still puts dog treats on the grave.
Granny Weatherwax is the poster child for Never Mess with Granny. She's dueled wizards, dethroned mad kings, tamed wild unicorns, outsmarted vampires, and couldn't have been more of a hardass while doing so. Multiple species have names for her which translate to "Avoid at all costs". But she also Wouldn't Hurt a Child, kept love letters from her youth, has a pet kitten she keeps safe under her hat, and is in all ways the person you should turn to when you need help.
"It was worth a wound; it was worth many wounds; to know the depth of loyalty and love which lay behind that cold mask. The clear, hard eyes were dimmed for a moment, and the firm lips were shaking. For the one and only time I caught a glimpse of a great heart as well as of a great brain. All my years of humble but single-minded service culminated in that moment of revelation."
Mr. Darcy, from Pride and Prejudice, comes off as extremely cold to the point of being rude. In reality, he is merely very reserved and rather socially inept; his loyalty to and passion for those he cares about runs deep—but only those he cares about get to see his kinder side.
Sidonie of Kushiel's Legacy: the realm at large thinks that Sidonie has ice water running in her veins. And yet, once you get her behind closed doors...
Stephen Maturin in the Aubrey-Maturin series. An ever-suspicious, untrusting, icy-eyed intelligence agent who can kill without blinking - and a compassionate, liberal-hearted doctor, who adopts orphans, lends money without a thought, campaigns against slavery and sexism, and cares deeply for his patients and his friends.
Crowfeather from Warrior Cats comes off as cold and heartless to most of the world, except for Feathertail, and later, Leafpool. Both are his Love Interests, and his relationships with both end badly.
This is later deconstructed as he Took a Level in Jerkass. He doesn't show love to his son (who later turns evil directly because of Crowfeather's neglect) and makes it blatantly clear to Nightcloud that he only took her as his mate to make Wind Clan trust him again. And because of emotional and legal shenanigans, he breaks up with Leafpool and treats her like crap every time they meet, openly despising her and disowning the children he had with her. Also, Feathertail dies- ironically, urging him with her last breath to not use her death as a further excuse to close out the world. Guess what he does. So by the time the fourth series rolls around, he's just a plain Jerkass with no redeeming traits. Should have added a little more sugar there, buddy.
Honor combines this trope with The Woman Wearing the Queenly Mask. She is perfectly willing to face down her enemies with nothing but an icy glare on her face, even with her life and the life of those around her in the balance, but the several books in the series make it clear that she's a completely different person around the ones she loves. Which makes her love's death in the fifth book that much more tragic, and her vengeance that much colder. Her cool, stoic and professional exterior is not only a way to cope with all the crap that life insists on heaping on her, but also a strong leash on a certain deeper and darkerside of her personality.
President Eloise Pritchart, of the restored Republic of Haven. In public, she was a cold, cruel, merciless Political Officer. Behind closed doors, she was in a romantic relationship with the admiral she was supposed to be riding herd on, and the complete opposite of cold, cruel, and merciless. Once she became President, she became The Woman Wearing the Queenly Mask — but was still quite warm and personable in private.
Knight-Captain Ice from The Legend of Sun Knight: As the Ice Knight, he is (in addition to using ice magic) expected to act cold and distant, rarely speaking and never being friendly to anyone. Since the premise for the series is that the twelve knights aren't who they're expected to be, Ice is secretly a kind person who wants to be friends with everyone. Since he's not permitted to smile and hold friendly conversations, he conveys this by making sweets for everyone he cares for.
Live Action TV
Sherlock is an excellent example of this trope. He is cold and aloof to people in general, is a self-proclaimed sociopath who shows zero compassion for the dead bodies at crime scenes, and is disliked by most of the police he commonly works with. But get him alone with John, and he'll laugh cheerily, smile warmly, appreciate the night sky, and try to show friendship in his own dysfunctional way. He is also very warm to Mrs. Hudson, hugging her and kissing her on the cheek in A Study in Pink, and displaying an insane amount of protectiveness toward her in A Scandal in Belgravia. And then there's this immortal line...
Sherlock: Listen, what I said before, John, I meant it. I don't have friends. I've just got one.
Agent Dana Scully from The X-Files is very steely and professional towards most people. The only person who gets her to loosen up? Her partner, Agent Mulder, naturally.
T'Pol from Star Trek: Enterprise: using her cold exterior and her repressed but detectable emotions, she typically insults and berates people, but occasionally shows a compassionate side. She usually justifies both sorts of actions as logical, though it is often apparent to the viewer (and recipient) that this is mostly just a rationalization.
Her actions are due less to her personality and more to her species. Vulcans are a Sugar And Icerace as shown starting in The Original Series with Spock and his dad, and continuing throughout the franchise.
Bree fron Desperate Housewives, especially in the early seasons: formal and coldly polite towards most of the people, but warm and loving (or at least the best she could show) towards her best friends and her family.
Stefan Salvatore from The Vampire Diaries: Stefan has two distinct and very different sides to him due to his vampire nature. When Stefan takes in a huge amount of blood, he shuts off his emotions and become crazy, violent, cold, careless, and impulsive. When he feeds, he feeds so violently, that he ends up ripping the heads off of his victims, although afterwards he feels guilt and remorse and puts the heads back onto the bodies of his victims. When Stefan is not hyped up on excessive amounts of human blood, he is sensitive, loving, kind, compassionate, caring, empathetic, selfless, and helpful. This more human side is especially enhanced in the presence of Elena, and when Stefan is in his violent state, he cannot find it in himself to hurt Elena.
Zoe from Firefly is cold towards everyone, although she does occasionally show glimpses of a softer side around those she cares about. Especially her husband Wash, who she can be genuinely warm to.
Simon acts frosty towards strangers, but warms up as you get to know him. He is particularly warm towards River.
More like "everyone" from Firefly is like that, except the too-awkward-to-manage it goofball manchild Wash and wide-eyed naive girl Kaylee. For Mal's easygoing roguish charm, it's just one of many facades, but the rest of the crew are deep down warm people who have closed up and become very guarded in a hostile word... Even the simpleminded but brutal and traitorous ruffian Jayne hides a soft spot for his family, adores his momma, and "works" hard (at crime, violence, and selling out his comrades) to be a good son and send money home to support her and, apparently, his younger siblings.
Most of the Angelic soldiers from Supernatural seem to fit this trope , usually because they cycle between professionalism, annoyance/racism towards humans, and very warm relationships with their brothers and sisters. The female angels tend to be more extreme examples of this trope than the males, but Cas could be considered the prime example; he's constantly switching between cuddly devotion to his siblings and an uptight seriousness made even more uncomfortable by his complete lack of social skills. Other examples, include Rachael, Uriel and Anna.
When she's around Crazymode!Castiel, Meg mellows somewhat into an "Ice and Sugar " personality -still cold and aggressive but with occasional warmer moments - although the jury is still out on whether she's just using this to manipulate him, or actually feels loyalty towards him.
Horatio Hornblower in the A&E series: his introverted nature, combined with the need to maintain a professional demeanor as a naval officer, doesn't lend itself to much emotional demonstrativeness. He does, however, open up to a few people, mostly some of his fellow officers and a few trusted sailors, and he just tries so hard to do the right thing. Unfortunately, despite his awareness of his inadequacy, he acts mostly cold towards his wife Maria, who adores him unconditionally in return.
Ned from Pushing Daisies is usually polite yet aloof and snarky, masking his feelings due to his traumatic childhood and avoiding close relationships. Inside? Oh, so warm.
Mako, Shinken Pink, from Samurai Sentai Shinkenger: Mako's specialty is dealing with her teammates' many issues quickly and practically. Once you're righted, however, don't expect a cuddle for the sake of cuddling.
The following year's Sentai, Tensou Sentai Goseiger, has Hyde/GoseiBlue. In episode 2, team Secret Keeper Nozomu initially dislikes Hyde for his frosty, dismissive attitude, but warms up to him on seeing Hyde's determination to remain on earth and protect humanity.
And then Kaizoku Sentai Gokaiger brings us Joe Gibken/GokaiBlue. Stoic, cool-headed, and prone to glowering, he nevertheless shows true affection for his crewmates and bakes them a "thank you" cake in Episode 4.
Temperance Brennan from Bones so seldom shows her soft side that it's easy to think she doesn't have one, but she does. This can be seen, for instance, in an early episode where she's talking to a boy who, like her, grew up in foster homes.
In Blake's 7, Avon: "I have never understood why it should be necessary to become irrational in order to prove that you care, or, indeed, why it should be necessary to prove it at all" but goes to great lengths to rescue his companions and defends the alien crewmate Cally in his own inimitable style ("She's more human than I am.") when the other humans head into a little Fantastic Racism.
Dr. K from Power Rangers RPM fits like a glove. She has a rather sour personality and can come across as blunt and occasionally downright mean towards the Rangers, especially Ziggy. However, her cutesy Zord Attack Vehicle and suit designs, along with her diabetic sweet tooth, show off her sweeter side.
Max Black on 2 Broke Girls is cynical, dark, and self-described as being "dead inside" (likely the result of her Hilariously Abusive Childhood), but is actually deep-down a good person and has shown genuine friendship towards Caroline, including letting her move in with her after just barely meeting her, and Earl the diner cashier, who is the only one she is not sarcastic or snarky to.
Prue Halliwell on Charmed is cold with most people, with her warm side mostly shown towards her sisters Piper and Phoebe.
Chuck has Sarah Walker, who has a tendency to mask her emotions due to many traumatic events in her life. However, she is very warm and loving on the inside.
Prince Arthur from Merlin has to maintain a professional, calm demeanour in front of the court and his knights, but relaxes considerably when he's with Merlin, and more so with Guinevere.
Like his book counterpart, Ned Stark has this in Game of Thrones. His son, Robb, seems to have inherited it.
Emily Prentiss from Criminal Minds: detached and sarcastic with most people (to the point she finds her love life disappointing and prefers to live alone with her cat), but warm and friendly with the rest of the team, especially in season 7.
Captain Apollo from the original Battlestar Galactica maintains his stoic demeanor while on duty, but often displays warmth and openness towards his friends and family, especially his father, his adoptive stepson Boxey, and Starbuck.
Star Trek: Deep Space Nine: Garak is a rare example of the reverse of this trope. He's warm, approachable and friendly on the surface, which is a mask hiding a ruthless, cold-hearted killer. As the show wears on, this mask is revealed to be much more complicated: He's warm, approachable and friendly on the surface to hide his ruthless, cold-hearted inner nature, which itself hides the most deeply concealed part of his personality: the warm, genuine attachments he does actually form. All three parts (the fake amiability, the ruthlessness, and the genuine affection) make up the person he is, and if that sounds confusing to the audience, it's equally confusing to the characters around him. In fact, even he has a hard time keeping track of what he's truly feeling about what's going on around him.
In the same show, Odo shows his softer, caring side when Major Kira is around. Noted in Season 6, Episode 21 The Reckoning:
Major Kira: You love to bring up the worst case scenario in these meetings, don't you?
Odo: Somebody has to. Besides, everyone expects me to be dour and suspicious; I don't want to disappoint them.
Major Kira: If only they knew the real you.
Odo: That is the real me - at least as far as everyone else is concerned.
Smallville: Emil fits this pretty well. He's generally pretty detached and awkward, but he does care about his team and sometimes shows it. (Such as the end of "Kent" when he gently tells Tess that maybe she is a better person than she thinks she is.)
Carson from Downton Abbey is incredibly stuffy most of the time, but demonstrates a softer side with certain people and/or when no one will find out. For instance, he refuses to go to the fair with the rest of the staff, just because they'd feel the need to be on their best behavior if he was there, and instead spends the day with baby Sybbie.
Susan Ivanova of Babylon 5 was like this, especially in the earlier seasons. Very stiff, serious, and formal, she even went so far as to not use contractions on at least one occasion. After a while though, she started letting her hair down (literally and figuratively) and showed a kinder, more vulnerable, and sometimes hilarious side. Throughout she maintains her professionalism while on the job, though she does become more of a Deadpan Snarker, especially when irritated. Word of God is that this was at the request of Claudia Christian, who wanted a chance to be funny with her character.
BIONICLE's Kopaka, aToa of Ice, is a stone-cold loner and The Stoic of his team, but when it comes to his fellow Toa, he's ready to risk life and limb to ensure their safety — when Pohatu had a Disney Death, it shook him so much that he was ready to give his own hard-earned mask to Pohatu's people, and was especially joyful when he found him alive a few seconds later.
The girl who's the subject of Savage Garden's "To the Moon and Back" mixes Broken Bird with a Sugar and Ice Personality.
But somewhere in a private place she packs her bags for outer space
And now she's waiting for the right kind of pilot to come
And she'll say to him...
"I would fly to the moon & back if you'll be...
If you'll be my baby
Got a ticket for a world where we belong
So would you be my baby?"
Love Handel's "You Snuck Your Way Right Into My Heart" seems to describe this trope rather accurately:
I put up barriers
To shield my emotions
A wall that you could never break apart
But like a ninja of love
Rappelling down from above
You snuck your way right into my heart
Not unlike the Mary Poppins example listed above — but with a lot more energy — this is how the 2013 stage adaptation of Charlie and the Chocolate Factory approaches the Interpretative Character of Willy Wonka (who is, after all, both a Mad Scientist and Reclusive Artist!). He's preoccupied with the business of the tour and showing off his wonders to the group, and outright frosty towards them much of the time. When the bad kids of the group destroy themselves via their vices — and despite his warnings — he is blithely indifferent. Finding the sweeter, warmer side of his personality is a matter of appreciating and understanding his unique way of thinking, especially in regards to artistic creation/invention.
Lamia Loveless from Super Robot Wars Advance: On the outside, she's mostly cool, professional and serious, but considering that she is The Child amongst The Three Faces of Eve (being the latest version of the W Numbers and not having been around for long in the world), her inner side is very warm. In OG Gaiden, she slightly warms to Axel, who saved her life.
Ring Mao acts like this towards Irm, to the point where she acts as if their relationship never existed when she gets the slightest bit mad, despite the fact that she still cares about him.
Badass Bookworm Erk from Fire Emblem 7, in a way. He's not the easiest person to coax out of his shell and away from his books, and he's frequently grumpy and sarcastic. But his supports always end up showing his gentler side, especially his supports with Nino, Priscilla, and Louise.
Lute, too. Well, sort of. She is very similar to Erk in her bookishness; she doesn't quite seem to know how to love properly, but her support with Artur shows an attempt at a softer side. (She is a bit odd about it, though.)
Soren from Path Of Radiance is only friendly towards Ike. This is explicitly mentioned by another character in the sequel; they can magically sense that someone is causing his icy heart to defrost.
Yet another mage that exhibits these traits is Arthur from the 4th game. When he expresses concern for his friend (and possible love intrest) Phee, she mentions how odd it is that he's thinking of someone other than himself, and he says that she's an "exception". The only other person who he shows his soft side to is his beloved little sister, Tinny.
In the fourth and fifth games, the Lance Knight Fin is explicitely regarded as having a Sugar and Ice Personality. His old friend Selphina lectures him on being cold to women and how this apparently ruined his relationship with Lachesis, but later Leaf comments on how Fin simply "forgot" how to cry or laugh ever since the fall of Lester. And then we have his behavior when he talks to Altenna in Seisen, where Fin can finally show open emotion and cries.
Oracle Of Tao has Ambrosia, the hero, who is ostensibly a Tsundere. Behind this layer however, her emotions turn out to be very guarded, and she has to go through an ordeal of sorts to finally unlock them. The best way of putting this is that she's a Mood-SwingerKuudere with some Cute and Psycho tendencies (as a result of her mood swings).
Marina Wulfstan of Valkyria Chronicles is an aloof sniper with several potentials and a personnel file indicating her preference for solitude — but that doesn't stop her from chasing after cute little foxes and puppies, as well as showing a good deal of commitment to defending Darcsens in the DLC packs.
Roswell from Yggdra Union leans heavily towards the cold side of the equation, but every now and again he shows moments of incredibly heartfelt gentleness. Interestingly, many of these moments seem provoked by Yggdra, our lovely protagonist.
Yurika Kirishima from Rival Schools is a pure example — she's rather reserved and cold for the most part, but it's part of her facade as The Mole planted in Seijyun High. When she goes through her High Heel-Face Turn, she starts to open up emotionally, with the most visible example being her Romantic Two-Girl Friendship moment with Akira in the Seijyun High ending.
Leona from The King of Fighters fears she'll be dominated by her Enemy Within (Orochi Leona) if she shows emotions openly... When the domination happened the first time, she killed her parents and everyone else in her Doomed Hometown. The second time, she beat her teammates and brother figures Ralf and Clark to almost death. Naturally, the poor girl struggles a LOT with her feelings and thoughts, and it's only around XIII that she truly can come to terms with them.
Lieselotte Achenbach is, for the most part, cold and unemotional, only really showing emotion after she realizes Mildred's plan.
The sequel also adds the super seriousZenia Valov. She wastes very little words and, most of the time, she's quite confrontational, caring most about her missions. In her ending, however, she is seen tending some sort of orphanage and smiling, and the kids greet her warmly, signifying that she's really kind and sweet to children.
Celes from Final Fantasy VI, due to her Broken Bird status and the fact that she is initially cold and pessimistic before being defrosted by Locke. After the halfway point of the game, Celes becomes much more friendly towards the rest of the party and is altogether more optimistic and hopeful, to the point where she eventually becomes their unifying force.
In the Final Fantasy VII prequel Crisis Core, pre-insanity Sephiroth is shown to be aloof, cool, and professional...but also capable of displaying concern (about his friends Genesis and Angeal), empathy (allowing Zack to return to Midgar to check on Aerith), and humour (to the point of cracking a wry joke or two).
Vincent. He speaks little, and appears cold and uncaring at first. As the party gets to know him, he gradually shows a kind, helpful, and protective nature.
BlazBlue's Rachel Alucard is like this, though the caring is very hard to see. But when one considers she's playing Xanatos Speed Chess against the psychopathic Terumi, who'd do any number of horrible things if he knew she cared about any of the cast, one realizes that she is mostly The Woman Wearing the Queenly Mask. However, various endings suggest she has a good deal of sympathy for Ragna (who she asks to "not become a monster"), Noel (who she's seen standing near during her "waking up" dreams), and Nu (Who she pities as a "poor doll" who has such simple dreams).
The Sten in Dragon Age: Origins is the most stoic and rigid of your party members, rarely getting along with others and preferring to focus on accomplishing your goal as soon as possible. However, Leliana notes that he does indeed have a hidden Gentle Giant aspect to him (which she chides him about) and if the player improves their relationship, he proceeds to become part of the True Companions in his own way, even sometimes addressing the player character with an affectionate pet name if he likes them enough.
Fenris in Dragon Age II is also this. Even though he hates mages and is always brooding about his past, it doesn't hinder him becoming open to his fellow companions after his long stay at Kirkwall and their helping him against his Tevinter captors.
Oddly enough, Merrill. If you rival her, she's arrogant, irritable and snarky around Hawke, while being her usual sweet, amiable, Cloud Cuckoo Lander self around everyone else. The difference between her general personality in Origins and the second game also has this contrast.
Luminous Arc 2's Fatima the Shadow Frost Witch is pretty darn stoic and cool. Her warmer side can be brought out if Roland chooses the correct dialogue choices and she becomes his love interest.
Miranda, from Mass Effect 2, is called an Ice Queen by Wilson at the beginning of the game (...before she kills him), but she warms up to Shepard considerably during the course of the game. And there's the relationship she has with her sister, Oriana.
Toona/Raven in Rune Factory 3: cool and seemingly emotionless, she gradually opens up if you pursue a relationship with her. Her reason for being cold is actually a fear of losing those who get close to her, due to a childhood friend disappearing in her presence, and the fact that she can turn into a Phoenix-like monster.
In PokÚmon HeartGold and SoulSilver, Gym Leader Jasmine (who uses Steel-type PokÚmon) is described by one character as trying to hide her tenderness behind her steely coldness.
Aqua from Kingdom Hearts is directly stated to be one of these (not by the trope name) in an interview with Tetsuya Nomura. She's the type where we see mostly the Sugar side and is also an honor student type. Isa establishes himself as one in a single cutscene.
In The Legend of Zelda: Skyward Sword, Peatrice (the storage girl) has a boring job, which makes her seem rather uncaring about anybody who comes around, but as Link continues to visit her, she starts to like him more and more. Eventually, she begins to fall in love with Link.
Misaki in Canvas 2 is probably the gentlest person in the cast, but her normal demeanor is rather distant and cool.
Sora from Yosuga no Sora. If you're not her brother, consider yourself the luckiest person on earth if you're able to see her smile. To be more precise, she is Tsundere to her brother, Yandere to every other girl around her brother, and cold to every other boy beside her brother. And you may have noticed already but, yeah, she has a sexual desire for her twin brother.
Akira of Togainu no Chi is cold towards everyone. However, when push comes to shove he shows that he truly cares about the people close to him even after they've raped or betrayed him earlier.
Miku in A Profile was raised to be cool, dismissive and aloof, which is both contrasted and enforced by the fact that at heart she's a Shrinking Violet, meaning she hides that behind the aloof behavior.
Rider is like this. She's actually a sweet and caring person, but it's difficult to show it when you're Medusa, especially when you happen to live in the Nasuverse, land of unhappy people. Look how shocked she gets at a mere 'thank you' or being told that no, Shirou does not hate her and thinks she's actually quite attractive.
Saber is an obvious example herself. While she may appear to be completely stoic and expressionless, this is just a mask for the emotional conflicts left from her past life as King Arthur and eventually shows a much warmer side of herself.
This is Rika Furude's real personality in Higurashi no Naku Koro ni. She tries to be serious and always in control because of centuries of being trapped in a "Groundhog Day" Loop, but she still has emotions and cares about others like her friend Satoko.
Mio from Little Busters. Riki initially finds her in a remote garden away from anyone else, reading books on her own. In their first meeting she's polite but quite dismissive - when he leaves, Riki notes that the meeting seems barely to have touched her at all and that as soon as he left she immediately returned to that distant world belonging only to her. However, as they become friends Mio begins to open up and shows a very sweet side to her, most notably when Riki helps her to find a book that is very important to her and she smiles, causing Riki to think she looks very pretty that way.
Hatoful Boyfriend has Fujishiro Nageki the mourning dove. In his Dating Sim route he mostly seems aloof, subdued, and like he barely tolerates the protagonist, until near the end. In Holiday Star he is a bit more demonstrative and resorts to I Feel Happy, apparently aware that otherwise the protagonist won't have a clue how he's feeling. He also demonstrates that while his friends are exhausting and frustrating sometimes, he's happy to have them and would burn a hundred times for their happiness. All along it's easier to see his contempt, when he feels it, than any of his other feelings.
Sakuya also shows this personality in the original game, due to being a Sheltered Aristocrat raised to believe himself inherently better than all other birds due to his bloodline. His Dating Sim route revolves around pushing him out of his contemptuous comfort zone, revealing his more vulnerable and passionate side.
Shin from Morenatsu is cold and distant to most people except to the main character, Hiroyuki. Once Shin realises that he's falling in love with Hiroyuki, Shin tries to stop the relationship due to childhood trauma but in the end they end up together in his route. His worst ending on the other hand...
Antimony appears to be a Defrosting Ice Queen, but despite being warm and friendly to the few people she's already befriended, when she's with her classmates in general she does things like this. When the group snuck out in "Power Station", Annie hardly talked to anyone except Zimmy and Gamma before being plunged into Zimmingham. Due to her descent and background Annie not only used to being a loner, but had more intense attitudes mostly limited to "surgical steel" and "firestorm" modes. Once the latter became quite literal, she chose to train in handling her temper. Annie certainly shows more emotion in her face than she used to, though still seems to be quite stoic and quiet around people she isn't close to.
Genius technician Equius Zahhak would like to have you believe he has nothing but contempt for the lower castes. But put him beside Nepeta and he melts like butter.
Dirk Strider is a pretty good example himself, proving Rose likely gets it from the Strider side of the (ecto-biological) family. Like Dave, his face rarely ever strays away from a stoic mask, but unlike Dave he doesn't hide behind snark and irony nearly as much, and is pretty openly nice to his friends for the most part, especially Jane and Roxy.
Karkat Vantas might count; when you first meet him he seems to be nothing but a snappish, preposterous jackass who likes insulting others as much as he hates everything else. Then you get further into the series and learn that once all hell breaks loose, Karkat breaks just about as fast. Especially when his friends start falling like flies.
The "Su-cool" arc in the "Love Situations" category of Tsunami Channel has a prime example of an honest and cool girl who is blunt and unembarassed by her feelings of affection, while being incredibly understated and calm.
In Go Get a Roomie!, Lillian's default approach towards the waking world is aloofness, but time makes it clear that she does care about the people she's with.
Himei in Sailor Nothing: At first, she is almost entirely cold towards everyone, but as the story goes on her warmer side starts showing more often.
Tenzin seems 100% serious and proper all the time, but is very warm around his family and clearly cares very much for Korra.
Lin is a stone-cold hardass, but shows a warmer side when she and Korra work together to fight Amon and Hiroshi Sato and it's clear she still cares about Tenzin, her ex-boyfriend.
Mako counts too: most of the time, he's a stoic strategist, but he clearly shows affection towards his brother Bolin and his friends.
Daria Morgendorffer from Daria only shows affection for certain people, normally just a smile and/or blush. Towards everyone else, she is cold.
Agent Six from Generator Rex fits the part of a Man in Black, often acting in a curt, very tactical manner. However, he cares greatly about his charge Rex (whom he rescued in the first place) and Holiday, with whom he'd have a closer relationship if he weren't so mindful of keeping it professional. He does ask her out by "A Family Holiday," but does so while keeping a completely straight face...and holding her hand.
X9 from Samurai Jack is nothing but a Professional Killer as cold as the steel he is made of to anyone he has to kill. But he is a kind and loving companion to his dog, and deep inside he feels guilty about the innocents he has killed.
Octus from Sym-Bionic Titan, while a robot, apparently has emotions, which he normally keeps in check so as to be the balance between the often bickering Lance and Illana. His warm side is shown when he's around Kimmy, who he says brings him something like "happiness." His warm side can also be seen at times around Lance and Ilana, as well as when he's watching Animal Friends.
Raven in Teen Titans acts coldly towards everyone, partly due to attachment issues but mostly because her powers are tied to her emotions, and if she doesn't keep iron control over them at all times, she could get a dangerous case of Power Incontinence. However, she's willing to go to almost any lengths for her friends, and we occasionally see glimpses of her softer side.
In the episode "Spellbound", she acted very sweet and girlish towards Malchior; however, by the end Malchiormade her regret even having a warmer side. For a while after the episode, she became visibly more withdrawn. Though when Beast Boy tried to comfort her, she did go out and give him a hug as thanks.
Played up even more sharply in the Season 5 episode "Hide and Seek." She couldn't stand having to babysit three kindergarten-age superheroes at first, but gradually she warmed up to them and turned into a full-blown Mama Bear when they were in danger. "Nobody messes WITH MY KIDS!", indeed.