WARNING! MASSIVE SPOILERS!! Lucina reveals herself to Chrom as his daughter and begins crying. As he wipes the tears from her face, shes runs into his arms and cries on his shoulder. All the fans hearts melted. Also counts as a Tear Jerker.
Following that is Lucina's reunion with her mother.
In Yarne's supports with her they both vow to protect each other. Yarne realizes how alike they are, both taking blows to protect the other, and in their S support, he asks her out, as he wants to keep her safe forever. Doubly impressive, considering she's royalty.
The supports between Henry and Olivia, also include a little Tear Jerking, as we learn about Henry's childhood.
Hell, almost every support with Henry is a mix of heartwarming and tear jerker. No joke. With Cherche, he becomes friendly with her and Minerva, nearly getting his hand bit off alone in rank C. In rank B, we learn Minerva reminds him of a Giant Wolf that became his only family in perception because his mother and father were such terrible people to him. The Giant Wolf one day visited him in his village, and was shot to death where she stood by the hunters. He then made them pay.
On a separate note, Henry and Lissa's Supports involve Lissa losing sleep because she's worrying not only about her allies dying, but also her enemies. Henry then uses a curse on her (the nonlethal version) so she can fall asleep. When she asks about how he did it, it turns out he has to do a fresh sacrifice, and usually uses little birdies. The heartwarming is after she tells him to stop doing it, not only does he stop using birds for sacrifices, but she falls asleep on him, and at the beginning of the S rank, turns out she's been using him as a human pillow.
Also Henry and Sumia's supports. In the C one, she's berating herself for her clumsiness but Henry doesn't seem to mind that much and helps her via temporarily fixing the stuff she broke so she can replace it. In the B one he explains how he uses his curses for daily things and offers to help her learning magic. In the A one they switch bodies and they're kinda weirded out when back to normal, but in the S one it turns out they did it again... so Henry could ride her Pegasus without being rejected by it — and this is followed by their love confession in which Henry starts saying he believes Sumia is actually an Ill Girl since, when in her body, Henry-as-Sumia's heart raced so fast... but after talking a bit more, they see the same happened viceversa (to Sumia in Henry's body), so yup, they're in love. And to crown it, he adds that when in Sumia's body, he brought her an engagement ring. Which is the other reason why he asked for a second body switch.
Sumia: "You've cast the best hex of all... And I couldn't be happier!"
Maribelle and Gaius's supports, even before S-Rank, are unbelievably sweet. The first rank has Maribelle raging at Gaius because he is to blame for Maribelle's father nearly being executed; Gaius broke into the royal treasury and framed Maribelle's father for the crime. In the B-rank Gaius reveals that he only framed her father because he was following orders from a noble who wanted Maribelle's father out of the picture. And then in the A-Rank, Gaius apologizes to Maribelle, insisting that he instantly regretted framing her father, and that he even sent a confession letter to the courts at the last minute to try and stop the exectution. Maribelle claims that it was that very letter that did stop the execution, and therefore saved her father's life. Finally, Maribelle asks Gaius why he'd been so willing to follow the anonymous orders in the first place. Turns out the reason is that the noble in question had threatened to kill...Maribelle.. Gaius did it all for a girl he'd never met and probably never would. And the cherry on top, after Gaius constantly repeats how much regret he feels for the whole mess, what does he say?
Gaius: Now that I know you, I'd make the same decision a hundred times over.
All the S supports between characters have elements of this, but those between the Avatar and another character are particularly touching.
In a male Avatar's S-Rank with Sumia, she gives up on the escapist reading to improve herself. When Avatar offers her a ring but admits he can't give her status or a fairy-tale romance, she says it already is one for her.
Vaike has a ring prepared for the Avatar, but this being Vaike, he loses it. He frantically searches for it, and the Avatar catching his sketchy behavior doesn't make it any easier. Cue Sully's terrifying horse, who has been been out to get him for peeping on the women in the army bathing the entire support, finding the ring for him and nuzzling the Avatar.
Chrom's S-Rank with the Avatar can be particularly adorable depending on your take. It starts out with the Avatar wanting to discuss tactics with Chrom, who becomes more nervous and nervous as the conversation passes until the Avatar notices and asks them what's wrong. Cue Chrom flat-out hyperventilating as he tries to admit his feelings and expressing happiness once the Avatar admits she's in love with him too.
Chrom: You do? But that's...but that's... Wonderful! Ah ha ha ha! This is the best day of my life! Avatar...listen to me...
Tiki's S-Rank with the Avatar is a combination of heartwarming and hilarious. The scene might end up veering into Tastes Like Diabetes for some, but it's just plain adorable. It starts out with Tiki calling out the Avatar's name, leading into a short discussion of why she's decided to stop calling him "Mar-Mar"... only to then confess that she's fallen in love with him. The Avatar then responds with how he thinks she might find him lacking in comparison to Marth, note Avatar: Well, you've lived for millennia... Seen the legendary heroes with your own eyes... You knew the Hero-King Marth himself! And compared to him, what am I? I felt that I had to be as great as him, as mighty and powerful... Otherwise, you couldn't help but find me lacking in comparison. to which she responds that no, he's not lacking. Cue d'aaaws all around.
Avatar: Then the two of us together shall build a new world of peace.
Tiki: Oh, Avatar, that's just what I want as well...
The male avatar's supports with Olivia involve them bonding with each other over making Olivia's dream to make a theater come true. In their S support, Olivia begins to lose hope in her dream as she hasn't been able to save as much as she would like to and states she wouldn't want to drag the avatar into her hopeless dream since he's so important to her. The avatar then suggests that they pursue her dream not as friends...but as husband and wife. Needless to say, this renews her determination in making her dream come true and gives players cavities.
Lon'qu and the Female Avatar have an amusing S-Support where both of them some difficulty wrapping their heads around the idea that they really do care about each other to such an extent. Even then, they warm up to it so easily despite their squabbles, and their better understanding of each other's issues lead to Lon'qu actually hugging the Avatar as a tame suggestion of hers.
Male!Avatar and Nowi's S support. In their B support, Nowi gave Robin one of her most treasured possessions: a really shiny rock. When Robin proposes to Nowi, he shows it to her again, only this time, it's been cut and put in a ring for her. Nowi may be a controversial wife option, but that is just plain sweet and adorable.
The supports between the Avatar and Emmeryn may taste like diabetes, but everyone agrees they're this, especially given their relationship's ending.
Her conversation with Gangrel in Hot Spring Scramble also qualifies.
ALL parent/child supports, as well as the scenes between parents and children in their recruitment sidequests.
Cynthia has one with her father where she admits her being clingy with him is because she understands time travel and realizes that he will eventually have her present counter part that won't be her and she is willing to accept not being around during that time as long as they are able to forge memories now that both she and he can always keep.
Lissa and Owain's stand out too, especially when she glomps him for being such a caring son in both B and A.
There's something to how she immediately takes to being called "mother" and calls her son "sweetie" and the like.
Owain wants Lissa to pick a name for her stave. She decides on "Owain":
Owain: Mother, that's MY name.
Lissa: I know, silly! It's the name of that which I value most in the whole wide world! What better name could there be?
Morgan's support with his/her non-Avatar parent end with him/her recalling only a very vague memory of their father/mother smiling at them and calling their name, but it's enough for Morgan, and their parent promises to always be there for them.
Laurent is identical to his mother in many ways, including coming off as emotionless and feeling the need to be mature. His A support with his father proves that he does have a facade, and the fact that he came from the future to the present first and spent all of his time alone for five years has made him afraid of possibly going crazy. Cue his father comforting him as Laurent breaks down.
Adding to that is the fact that it's one of Laurent's only conversations when he speaks normally, as opposed to the more meticulous speech his mother uses.
Pair Up two characters who are married, or parent and child, and have them step on an event tile. Prepare to have your heart melted.
Even better, pair up a unit with his or her spouse and view either of the couple's portrait in the in-battle animations (by tapping their character portrait on the touch screen), he or she will be blushing!
After completing Chapter 10, Chrom begins to suffer a Heroic BSOD in the aftermath of Emmeryn's death. The Avatar assures Chrom that he/she will help him through whatever trials he will have to go through, followed by everyone giving their own words of encouragement to him, culminating with Chrom thanking everyone for their support.
And what happens afterwards? It's revealed Emmeryn's death caused many of the Plegian soldiers to desert, tired of all the violence.
In the Final Chapter of the game, the Avatar can opt to pull a Heroic Sacrifice where he/she does a "I'm Taking You with Me" on Grima since you are both one in the same. This guarantees that Grima doesn't come back again at the cost of your own existence. Chrom and the surviving members of your team all refuse to believe you're dead and plan on searching to ends of the earth until they find you.
After the credits and "THE END" screen pop up, the game goes into another CG sequence of Chrom and Lissa finding you in a field, just like in the prologue... but this time, the Mark of Grima is gone from your hand and after pulling you up, Chrom says "Welcome back. It's over now."
If the Avatar is married, the notes on how he/she went on to live her life his/her life after returning state that the Avatar's origins and past are still unconfirmed and contested, but that one thing is for sure: He/she loved his/her spouse dearly.
If the player chooses to let Chrom make the final blow, this spares the Avatar but will also allow Grima to return Back from the Dead one day in the future. The Avatar will feel guilty because of this. However, his/her spouse and kids will remind him/her that he/she still got a family.
Lucina's supports with a Male Avatar, in which he continually goes out of his way to ensure she's not overworking herself and remind her that she is not alone.
Lucina's support conversations with her parents. ALL OF THEM!
Her A rank support with her sibling will also make you go all "D'AAAAAAW!"
Say what you will about Tharja, her A support with Ricken falls into this when he hits her with a happiness-contagion curse and makes comments about how pretty her smile is. It's also one of the only support lines that doesn't have her make a single comment about the Avatar.
Kellam is another one, and this one shows she surprisingly cares about her family a lot, and actually uses her magic in a non-malicious way (for once) to help Kellam's family take more notice of him. Despite her creepier habits, when Tharja's Hidden Heart of Gold comes out, it really shows.
A lot of Tharja's supports actually show her being a good person deep down. With Virion, she thinks her mind controlling curse worked, and she makes Virion do charitable things like building a bridge or repairing their comrades' tents so they're dry when it rains. The twist is that Virion actually wasn't under her control, and he was just doing those things because he likes her, so it's a double crowning moment of heartwarming.
Though the supports where this comes out belong to a different trope, Future!Tharja truly does love her husband, enough that losing him completely destroys her. If her husband is the Avatar, this means beneath the early creepiness, yes, there's genuine love there. For a non-Avatar husband, her love for him seems to have overpowered the obsession with the Avatar.
Tiki's voice actor for whenever she says "Mar-Mar" absolutely nailed it to show just how much she really loved him just by speaking his name.
The Avatar's ending if he/she is married. Though accounts wildly differed of what s/he acted or even looked like, the one thing everyone could agree on was that the Avatar loved his/her spouse above all else.
According to Owain, his father gave his life to protect him from an archer that ambushed him. Ever since then, Owain constantly brags about the blood of heroes that flows in him: the blood of Lissa's ancestors, and the blood of his father. That's right, he loves his dad so much, he regards him with the same amount of renown and respect as MARTH.
It gets an extra level of "d'aww" if Lon'qu is Owain's father, given that Lon'qu's supports with Lissa see him take an arrow for her during an assassin ambush.
It also gets some extra heartwarming if a male Robin is Owain's father. Despite Robin becoming Grima in Owain's timeline, Owain still considers Robin equal to his mother's bloodline.
Cherche telling Lon'qu that the parents of his late friend Ke'ri wanted to thank him for giving their daughter happiness with their friendship, when he thought that they hated him for failing to save her.
In Rogues & Redeemers 1, if you have Tiki talk to Marth, he won't recognize her. But he will say she somehow reminds him of someone very close to him.
There's also a conversation in that chapter between Seliph and Lucina where they realize how similar their situations are; both are currently fighting in armies led by their fathers (as Sigurd is identified as being the commander of the allied unit despite not being the Einherjar reward for success), but for a long time, they had been "chasing their fathers' ghosts", so to speak—leading their own armies to try to live up to their fathers' names.
If you visit the barracks on your avatar's birthday, all of the characters' will wish you a happy birthday instead of normal messages. Even characters like Lon'qu, Severa, and Walhart.
It's made more heartwarming when you realized the characters' happy/cheerful portraits are used. Standard barrack messages are always accompanied by the characters' default portraits.
Kellam's love confession to the female Avatar is the cutest thing ever:
"You make me feel like I-I'm really here. Like I mean something. I am yours... forever.”
And it's not just a feeling. It's the only paired ending he has where his name isn't lost to history.
In Yarne & Nah's A support, Yarne rescues Nah from skirmishers who took her by surprise. Their S support has them dealing with the aftermath of the ambush, where it's revealed that Nah has had trouble sleeping, she's so traumatized. Yarne, a self-admitted coward, swears to stand guard by Nah's tent and keep her from ever getting kidnapped again, and confesses that he'd fight anyone just to keep her safe. Nah declares him a hero, and seems to hug him in the final scene.
Chrom and the female avatar's conversations when they're married to each other in Summer Scramble. In the first part, Chrom notices how much the avatar is enjoying being at the beach, but she accidentally lets it slip that she's bothered that she doesn't have her memories from before she met Chrom. She tells Chrom not to worry about it, then runs off to check something out. Chrom then decides that he'd do something for her while they're there to cheer her up. In the second part, the female avatar comes across Chrom and a pile of broken seashells (he says he was trying to make a necklace, and that he has "a talent for smashing things in frustration"), some charred lumps that he says were his failed attempts at cooking fish, a collapsed sand castle, a half-built raft, and a "bug-infested tropical fruit salad." The female avatar tells him to save the beach activities until after the battle, but he shows her one more thing: a big message in the sand that says "Chrom & [Avatar] 4 Ever." Chrom asks if it made her happy, and the avatar lampshades the Narm Charm and says that she's not sure if she "should be happy or embarassed or...what, exactly..." but says that it's still certainly a sight she'll never forget. Chrom then reveals why he did all this: he wanted to help her make new memories. The avatar thanks him, and tells him that he didn't need to do all this and says that just being with him has given her "an endless supply of happy memories!" She recalls all of the happy memories that she has with him and says that she could never forget a single thing about him, even if death were to tear them apart or if she lost her memories again. Chrom then gets onto her for talking about such sad situations and gives her a "Shut Up" Kiss so she'll stop talking about such sad things! She chides him for doing something like that in the middle of a battle (though does admit it was wonderful) and tells him to stay in his position and continue fighting, and she runs off to rejoin the battle. She then says to herself that while it was ridiculous for him to do something like that in the midst of battle, at least he gave her one more memory she'll never forget.
Every character which is focused on (Chrom, Gaius, Tharja, Cordelia) could be added. For example, in Cordelia's conversation with a spouse Avatar starts off with Cordelia collecting pretty looking shells. The Avatar stops by, concerned that she was injured, when in reality she was picking up a shell off the beach, which the Avatar buys. Only after that does the Avatar even notice the pile of shells behind her. He's convinced by Cordelia that the shells were placed there by bandits and she moves them to a different location. In the second conversation, Cordelia has found the time to decorate all of her lances with her collected shells. The Avatar asks what she's doing with her lances...and she claims she was testing a new lance design, showcasing it by throwing one of them a far distances. Impressed, the Avatar decides to try out another lance before Cordelia stops him, claiming it's her favourite, admitting that she's been spending the day decorating while everyone is off fighting, and stating that the Avatar has to be disappointed in her and she'd be fine if he wanted to annul the marriage. The Avatar instead finds it refreshing that Cordelia actually has hobbies and relaxes...and begins teasing her. Being teased is a sore point for her and she charges the Avatar beating the Avatar and kissing him in front of the whole army. The Avatar is flustered, to which Cordelia suggests he plan a surprise romantic suggestion if it's bothersome to him, and that she'll be watching him...and only him. What's amazing is that they cover so many of Cordelia's personality points: her competitiveness and low self-esteem in particular.
If the Avatar is married to Gaius, she complains to him about risking his life snatching up shells on the beach in the midst of danger, believing he'll pawn them off for candy like he supposedly does with valuables he finds on the army's excursions. He's annoyed that she doesn't trust him, but admits he appreciates how she worries for him, and vice versa. Later on, he's falls for Robin's trap involving a bait of coconut brittle. However, instead of scolding him, she wanted to apologize, as she learned that the profits off whatever Gaius found, including the shells, were always used to anonymously fund the army. They have a talk though about his risky lifestyle, leading up to some playful banter and Gaius kissing Robin.
The Avatar and Lucina's spouse conversations in the Hot Springs Scramble DLC. The first part is relatively lighthearted, with Lucina empathizing with a fellow newlywed couple there and embarrassing each other asking the Avatar about the mixed bath. The second part is a bit heavier, with Lucina questioning whether she will be able to stay with the Avatar after the war is over (due to her status as a time traveler and his status as Chrom's tactician) and berates herself for not being able to put the Avatar before her mission. The Avatar responds by saying that she has every right to put saving the world first and that he will always stay with her no matter what she does. He even goes so far as to say that he'll find a way to come back from the dead if he dies. He plants a kiss on her and after he leaves to continue fighting, Lucina apologizes to the Avatar for the situation they are in and notes that he is the most important thing to her in the world, and her primary reason for ending the war is so that she can be with him. Considering how important her father Chrom is to her, the fact that she would consider the Avatar to be even more important is profound.
Also in Hot-Springs Scramble, a bit of Fridge Heartwarming here, but the fact that when Nah and Severa are debating plans to fish out peeping toms and punish them, they eventually realize they don't actually have any such peeping toms in mind, and they're getting worked up over a threat that for all they know doesn't even exist. The kicker of this is that it means that they both completely trust every single one of the male children not to spy on them... including Inigo, who you'd normally think would be the first name to be dropped, but no, he's not mentioned. Not even once. For all the flak he gets for his womanizing, this makes it blatantly clear how much they really do trust him.
If a female Avatar married Owain, there's quite a blend of lighthearted and touching during their conversation in Hot-Springs Scramble. It starts with humor (considering the spouse, it's not surprising) and an adorable realization they don't know that much about one another. Then it shifts to a sadder tone when the Avatar admits how she's missing plenty of memories like her own childhood, and fears losing the precious ones she has like before. To comfort her, Owain gives her both a Cooldown Hug and a mild "Shut Up" Kiss on top of it. He promise the Avatar that he'll stay by her side to keep those memories and remind her if she forgets, not matter how many times he may have to. The icing on the cake is the Avatar borrowing Owain's style of speaking when she's alone to monologue her happiness with him.
Inigo's conversation with the Avatar if he's married to her is also heartwarming. The Avatar's getting a little annoyed with how affectionate he is when they have to battle Risen. But when she think he's overdoing it with the closeness, he's actually taking a hit for her from a Risen targeting her. It's the one instance where the Avatar is crying, because she thinks she failed as a tactician to have him get hurt for her mistake.
The Hot Spring Scramble conversation between a Male Avatar married to Severa is also rather sweet in its own way. It starts off with Severa planning on using the trip as a honeymoon for the two of them, and she demands that he make plans for it. During the second part of the conversation, he says that he hasn't had much time to think about it with all the fighting going on and Severa understands, but takes a peek at the paper he's holding, thinking it's some new tactics for them. It's actually his ideas for their honeymoon. The prickly Severa is clearly moved to tears and opens up a little.
Robin (M)'s father-son supports with Owain in Hot Spring Scramble. Owain belittles himself for not being more like Chrom or Lucina, to which Robin responds that he's very proud to be Owain's father.
Male Robin and Kellam's A class support, where its revealed that the group is throwing a party for Kellam to remind him that they know he's there with them and they count on him despite what he thinks.
Hot Spring Scramble is CMOH incarnate. Two in particular are Emmeryn's conversations with Chrom and Lissa. As implausible as her survival is, it's clear that her younger siblings are grateful to have her back, even in the condition she is.
Also joining Emmeryn's Hot Springs conversations is Gangrel, who nearly crosses the Despair Event Horizon as he dwells on what he did for the first part of the game. Emmeryn decides to comfort him, despite his apprehensiveness to approach her, as he was the one who demanded her execution and drove her to the current state she was in.
"How in blazes did you get me to...love you? If you're trying to make a new man of me, it's...working..."
Cordelia proposing to Gregor in their S support. Keep in mind Cordelia's feelings for Chrom, Gregor thinking she could never feel that way for him, and that he was trying to help her win Chrom's heart. His tips worked...in Gregor's favor!
Cordelia: "I propose to Gregor!"
Actually, any of Cordelia's S supports where she proves that even if she'll never forget her first great love, she can love someone else and be happy with him.
Yen'fay and Say'ri's conversation in Hot Spring Scramble. After the way their conversation goes in the Paralogue where he's recruited, Yen'faycomforts Say'ri when their reminiscing reminds her that he isn't the same brother she knew and assures her that he does care for her.
If Lon'qu is Inigo's father, their conversation in The Future Past 2 doesn't start this way, but it definitely ends that way. Inigo assumes that Lon'qu has come from the afterlife to collect Inigo's soul. When Inigo tells Lon'qu as much and admits that he (Inigo) is finished, this conversation happens:
Lon'qu: ...Finished, you say? If you're that ready to die, I won't bother with any speeches.
Lon'qu: Inigo... I sentence you to death here and now... Prepare to die.
Inigo: Ack! Wait!
Lon'qu: What's the matter? Come at me. I'll make it painless for you.
Olivia and Inigo's A support is both heartwarming and a tear jerker. In the future, Olivia was teaching Inigo her favorite dance, but died before she could teach him the last half. Inigo would then practice the dance by Olivia's grave, making up his own ending to the dance and wondering what his mom would say as he practiced. Now that Inigo has his mother back, he can finally show her the dance he put together in her memory.
Yarne and Noire's supports. Not only it's one of the few supports where Noire will not go crazy but Yarne becomes seriously badass just to protect his similarly cowardly friend. and even more so, he becomes badass not just to protect Noire, but because she is the one who first said she'd protect him.
Noire and Brady, too. Noire doesn't go crazy there either, and they bond over their tendencies to get sick or hurt easily. Noire even considers the healing tent "their place".
Nah's supports with male!Morgan, particularly the A support, where he risks his life to find a super-rare flower just for her. Doubles as a Crowning Moment Of Awesome, as he clearly went through quite the epic adventure to get it, though we never get too many details, just that he's absolutely covered in cuts and bruises. The S support also stands out, for being her only romantic support where she confesses her love, and for this bit:
Morgan: You had a second wish? What was it?
Nah: ...for the person I love to love me back. But there's no need to ask Naga, because he cared for me all along.
They may end up on the end of generic parent supports, but the fact that some of the male characters with less than happy pasts concerning family like Henry (neglected and raised by a wolf), Lon'qu (grew up on the streets), and Libra (straight up abandoned), embrace becoming parents (and caring ones at that) is enough to make anyone's heart melt.
Specially in the case of Libra since, no matter who he marries (or even if he doesn't), he will always end up building an Orphanage of Love. His past was super lonely, yes, but he still has enough love in his heart to share it with kids who could have had his same sad story.
Cherche and Gregor's supports reveal that they have a connection neither knew about. Years ago, Gregor was hired into a group to collect wyvern horns, but the rest of his group decided to speed things up by hunting wyverns down instead of finding ones that were already dead. After the hunters killed a mother wyvern and threatened her baby, Gregor turned on them and saved the baby wyvern. Years later, that baby would turn out to be Cherche's mount, Minerva.
Lissa and Maribelle's A support, in which they discuss why Maribelle is so completely devoted to Lissa. Despite being nobility, Maribelle's overall temperament and sharp tongue made her a friendless outcast until Lissa approached her and offered to be friends. Lissa doesn't even think it was anything special, just that the other kids were jerks and that a great person like Maribelle didn't deserve to be treated like that.
Tharja and Libra's ending. If they get married, their new future has them founding an orphanage and living happily together. Tharja apparently learns to control her cursing tendencies as the children there come to adore her, and she secretly liked the attention. If Noire goes unmarried, then she joins them, but not to protect her past self, as Tharja doesn't wind up as the heart widow she was in Noire's original childhood. She joins them in order to live a happy life with her parents.
Their support conversations are heartwarming, too. It's quite sweet to see Tharja slip into mix between Adorkable and Tsundere when Libra confesses his love for her by letting her look into his heart. And while she's still mostly interested in her experiments in their A support, there's this hint of fondness in her words, if ever so subtle. Not to mention, of course, that her experiments on Libra has blunted the pain of his past that has burdened him for so long.
If Brady goes unmarried, his future has him becoming a world-renowned violinist, famous for his music being so beautiful and melancholy that it would bring all those who heard it to tears.
And all of his paired endings (except with Morgan and girl!Avatar) involve his wife having some sort of connection to his music. Kjelle stands out, learning music and performing duets with him, because she always wants a new challenge.
If Gregor and Nowi are married, then Gregor enjoys a life of plenty for a time, but then travels the world with Nowi.
And if he marries Cordelia, he also enjoys a life of plenty, but when he sees Cordelia work super hard, he decides to work with her.
In Tiki's ending, she returns to her duties as the Voice, but now comes down from her perch and visits the people more often.
Tharja's entire S support with Lon'qu. After their plan to simply remove his traumatic memories didn't work out, he tries to get close to her and overcome his fears through "tyranny of will". She notes that this method would probably take years and asks if he will let her help him. Not through magic or tricks, but through friendship and companionship, being together day and night. When Lon'qu pretends he still doesn't get it, Tharja outright proposes to him. Lon'qu accepts and offers her a ring...
Tharja: "... Wait. You had this ready the whole time? (smiling) Oh, you are a sly dog, Lon'qu."
There's something sweet about how despite his trauma and how he'd seem the type to not believe in love, Lon'qu has little issue with coming to terms that he loves someone and treats it in a very gentle manner. Even with someone he originally was extremely irritated by (the someone in question is the female Avatar), he later tells her that the feeling in his heart (caused by her) is "frightening... but wonderful".
Panne and Libra's supports. All of them have Libra realizing that for all Panne's cold attitude, she really does care about others. Their A Support has Libra finding out that Panne beat up some soldiers that were making 'off-colour' comments about him. Panne tries to brush this off - "Maybe I just wanted to hit someone that day" - but admits that she was angered by the comments after her conversations with Libra made her feel better. Libra is amazed at the kindness she shows, though she tries to hide it, no matter what the world throws at her.
Whether you ship it or not, Sumia rescuing Chrom is one of the sweeter scenes in the game.
Frederick's confession of love to Sumia is tooth-rotting glurge, yeah, but it's so geniune. He admits at first he kept an eye on her due to her clumsiness, but as time went on he began to see her as a wonderful person he truly wanted to know...and love. Sumia's acceptance of his proposal is pretty sweet, too:
I don't want the moon, Frederick. I just want you! So yes! Yes and yes and yes again! You've made me the happiest woman alive!
The best endings in the Future Past trilogy. C'mon it's impossible to not smile while watching the kids being grateful to be alive.
Considering that Sumia is super shy and insecure, the mere fact that she is the one who openly declares her love to either Henry or Gaius is adorable.
Priam's Love Confession to the female Avatar is both this and Adorkable. Priam, normally a super tough and seasoned badass, is seen blushing like a school boy and saying "HUZZAH!" when it looks like the girl he's in love with is gonna say yes to his proposal.
Severa and Owain's S support. Previously Owain had insisted on seeing Severa's weapon so he could think of a name for it. Severa lashes out at him and ultimately, in their B support, gives him such a severe tongue-lashing (including calling him a "creepy creep stuck in [his] own fantasy world") that it puts Owain, Owain, mind you, into an Angst Coma. She talks him out of it in their A support, and then in their S support, we discover why she was so reluctant to show him her weapon: She had already named it, and she had named it "Owain", because he was nice to her,even when she wasn't nice to him, and because she had a crush on him for a while.
Severa and Noire's supports, especially from Severa's end. While she's still very much herself, you can clearly see how much she cares for the girl; even in their A support when she calls her on being more helpless around her, she's completely okay with Noire depending on her for so much. Noire's trust in Severa is also super heartwarming.
In Future Past, what the kids say when they see their other world counterparts often fits in here quite well. The top case is Noire:
Noire: "Stay strong, Noire of this world... I'd say this to your face, but you look pretty panicked already... Best not to surprise you. But rest assured, I've got your back. And I swear I'll get you out of here alive. ...... You know, something about this place seems really familiar... Yes- this is the building we stopped to rest after we collected the Gemstones. I remember we talked about maybe staying the night here. But something about it didn't feel right, and we left soon after we arrived. Our future was like this one, but... I guess we were a tiny bit luckier. Seems the me of this world made a few unlucky choices... But that doesn't mean she deserves to lose her life! Looks like it's up to me to make sure that doesn't happen."
The comments the characters make during their support boosts in battle can warm you up too. Examples include:
Many of the Dual Guard quotes can be quite touching as well. And that's on top of the fact that support person is literally throwing themselves in front of deadly weapons to protect their partner. Especially heartwarming when they block an attack that would otherwise have been fatal.
If you let the Avatar deal the final blow against Grima, after the battle each character that you've recruited gives out a line about either wanting you back, going to search for you or their belief that you're still alive. All of these lines are incredibly heartwarming, but special mention goes to the Spotpass characters, who you recruited literally right before the final battle and more than half of them are former enemies.
Gangrel: “Damn you, Avatar! I joined this fight to meet my end, not secure yours! I'll chase after you to the ends of hell...and if you're there, well I'll drag you back!”
Walhart: “How we die defines how we lived. This can be said of Avatar. But I expect there are more pages yet to be written of a man/woman so nearly my equal.”
Emmeryn: “Avatar... Come back... I need you... We..need you... This world...needs you...”
Yen'fay: “...Avatar. 'Twas a life lived grandly ...... But was it lived to its end? I trow you are yet meant for more...”
Aversa: “What? Avatar, dead before me? Preposterous! Return, milord/milady, and you will have my service...”
Priam: “Avatar could not have arrived at his/her decision easily. But I won't accept it. This can't be the end of his/her story...”
In celebration for Lucina's Figma, Kozaki posted an image on his Twitter explaing how Lucina managed to hide her long hair while posing as 'Marth' (here's a link to the picture, in case you were wondering). Sakurai responded back to him, wondering who did her hair for her. Kozaki's response? "Probably a close friend, like Severa, did it for her...!"
A small one: in Disowned by Time, Chrom generally simply suggests that Morgan come with him to meet the Avatar. However, when Morgan is his son, the way Chrom immediately and instinctively slips into the role of 'protective father' is incredibly sweet.
Chrom: Until then, you'd best come with me. ...And stay close. I don't want you hurt.
Vaike and Nowi's supports. After Nowi has nightmares about being left all alone, Vaike assures her that that will never happen. However, she reminds him that after a hundreds years or so, everyone will really be gone. Later, Vaike tells Nowi about his dream to become an inspiration to the people of his home and improve life for everyone, but is somewhat envious of Nowi's long life and says how he could use an extra decade or two to achieve it. The two make a promise that if Vaike dies before his dream is accomplished, Nowi will accomplish that dream for him. This culminates in their S-Support, where after Nowi is still afraid of losing Vaike, he gives her a ring and tells her he'll never leave her, even after he's dead. This line he delivers crosses into Tear Jerker territory.
Vaike: Yes, even after I'm worm food! All ya have to do is close your eyes, hold this ring, and imagine me. Next thing ya know, I'll be standin' right next to ya! So stop worryin' all right?