Adaptational Heroism: His original mythology portrayed him as a prankster, too. However, he wasn't always nice with people and even may kill children with his snow without any regret. In other stories, he is a villain, but here, he is a hero and a kind soul.
All-Loving Hero: Implied to be one. Jack loves children, would never hurt them and tries to protect them as much as he can. Even though the Guardians left him alone during so long, he is always ready to help Tooth when her fairies are kidnapped. It is also implied that he never wished to hurt Pitch either, and was still sorry for him in the end.
And I Must Scream: Not as bad as at other examples, considering that he had at least some contact with some of the Guardians, but he was completely alone, invisible to the extent that people passed through him, and didn't know anything about himself or what he was meant to do for over three hundred years.
Anti-Hero: He's brave and heroic at heart, but also an incorrigible trickster who prefers to work alone.
Jack: Am I on the Naughty List? Santa:On the Naughty List? You hold record.
Jack is this toward every child of the story, which could explain the fact that he is the most connected to them amongst the Guardians. He can also be viewed as a Papa Wolf, too.
When Jack was still human, he and his sister were playing on a frozen lake. When the ice started to crack beneath his sister's feet, Jack used his staff to swap his position with hers, saving her, but also caused him to fall into the lake himself and drown. It is even said that his best memories are with his sister.
The Call Has Bad Reception: Jack is really The Hero at heart, and the Moon gave Jack his powers so that he could be a Guardian. Too bad no one gave Jack any indication of what he was meant to do with his powers, or even any memory from before he got them.
Casting Gag: Most likely unintentional, but having Chris Pine voice Jack Frost is a hilarious coincidence.
Character Development: He goes from an incorrigible, lonely trickster who prefers having fun rather than being a Guardian to a more responsible, brave person (although he is still a trickster).
Disappeared Dad: Implied, as his father is never seen during the flashbacks of his human self.
Does Not Like Shoes: He's completely shoe-less for the entire film. When offered a pair of blue elf shoes (with bells) from an elf, Jack cringes and stops the ceremony immediately. Near the end of the story, it is revealed that he didn't mind walking on ice barefoot, even as a human.
May be invoked as Jack was meant to be a bit more mean in early versions of his character the movie. Originally, Jack Frost's myth wasn't always kind, and could harm children with his powers.
Expy: He looks a lot like Roxas with icy blue hair.
Fragile Speedster: He is nimble and can dole out a few hard knocks like a glass cannon, but easily stuffed into a sack once caught.
Freudian Excuse: He makes a lot of mistakes during the whole story, like refusing the call of being a Guardian or exchanging Baby Tooth for his memories. He had been alone for so long, and is desperate for believers as well as knowing who he was when he was a human.
Friend to All Children: In the film, he has the closest relationship to children and enjoys spending time with them, even if they can't see him.
Fun Personified: Even compared to the other Guardians—including North i.e.: Santa. This is his center.
Kick the Morality Pet: He refuses to listen to Baby Tooth when she tries to prevent him from searching for his memories.
Kidnapped by an Ally: He's already well-acquainted with the other Guardians before the movie's events. However, in order to "persuade" him to join their team, they bring them to their base first via Bag of Kidnapping.
Lesser of Two Evils: The Guardians (Bunny in particular) were kind of reluctant to take Jack in their team because, according to Bunny, he was selfish and irresponsible. Nevertheless, they still took him because he wasn't as bad as Pitch is.
Light Is Not Good: At the beginning, he only remains as neutral. Then he grows up as a true hero.
Locked into Strangeness: Though we never get to see what the other Guardians looked like as humans, Jack gets pale skin and white hair out of the transformation. His eyes also change from brown to blue.
Magic Staff: He doesn't need it to access his powers, but the staff allows him to channel it and seemingly amplify it. It also seems to be connected to him directly in some fashion as being forcefully separated from it or having it broken causes him visible pain.
May-December Romance: Although their ages don't matter much anymore, he seems to have shades of this with Tooth.
Mr. Fanservice: He attracted an army of fangirls before the film was released.
Even Tooth is attracted to him, a bit like a fangirl could do (even if that's due to his teeth).
My God, What Have I Done?: When he realized he exchanged Baby Tooth against his memories. Even the others Guardians point it out.
Not Evil, Just Misunderstood: Despite being Jack Frost and being a Winter spirit, he clearly cares about children and wouldn't harm anyone in a malicious way, unlike what Bunnymund said about him in his first appearance. Played straight when Pitch gave him his memories, making others thinking that he betrayed them.
Not Quite Flight: Jack doesn't have true flight, but he can call on the wind to pick him up (flailing chaotically all the way).
Not So Different: With Pitch, definitely. In all ROTG materials, you can always find similarities between these two. In the movie, they both hate being alone and want to be believed in by people. They also are the ones who have a connection with the dark side (Pitch being completely evil and using shadows, while Jack is neutral at the beginning of the story. His ability of ice and cold doesn't always benefit people, not to mention that Pitch also thinks that Evil Is Deathly Cold, too). In the comics, they both have a staff and had refused the call of being a Guardian (before Jack's Character Development) which leads them to be cast out. Finally, in the books, it is said that Pitch had been killed by Fearlings while Jack drowned in ice water. Furthermore, both of them had a loved one they cared the most about (Pitch had a daughter and Jack had his sister) and they both became Papa Wolf by trying to save them from danger. It's almost understandable why Pitch thought that the two of them should go together.
With Bunnymund, too. They are apparently two seasonal spirits (Jack is winter while Bunnymund may be spring) which could explain their arguments. They also have a Big Brother Instinct or Papa Wolf behavior toward two children (Jamie for Jack and Sophie for Bunnymund). When they argue, they are as childish as each other.
North and Jack also have some similarities with each other when you read the books. North has nearly the same behavior as Jack when he was younger, as he was a bandit before being reformed thanks to his master Ombric. It is also said that he never had any friends or parents to get affection from, and had a Big Brother Instinct attitude to Katherine in almost the same way as Jack did to Jamie.
Papa Wolf: To Baby Tooth. And also toward Jamie as well.
Also toward his younger sister, especially as his father is never shown when he remembers his memories.
Parental Abandonment: Jack spent 300 years alone without any family or friends to guide him. His memories showed that he had indeed a family, but they died while Jack was an immortal spirit. However, when he learnt this, Jack was excited having a family on his own.
The Prankster: Not a malicious one, being carefree and highly sociable. Due to the nature of ice and snow, he's still pretty dangerous when he wants to be.
Pretty Boy: Tooth and her fairies fawn over his looks throughout the film - although it MAY be solely due to his teeth. Most definitely not to do with his teeth when you look at how many fangirls he has garnered in Real Life.
Really 700 Years Old: Jack looks barely past his late teens, but he's been around at least since America's early colonial times.
Refusal of the Call: When the Guardians finally do extend a membership offer to Jack, he rejects it, angry at being left adrift, alone and Desperately Looking for a Purpose in Life for 300 years. Although it might be justified. He had been alone during 300 years, and the Guardians never really paid attention to him, not to mention they never told him what he is supposed to do. So, essentially from his POV, he woke up from being frozen, is now an elf with white hair, and is alone with strange powers which he has to learn by himself, with no idea why he is still alive.
Replacement Goldfish: There are hints that the Big Brother Instinct attitude toward children are due to the ones he had toward his sister. You can't help but thinking about a slight similarity between Jamie and Jack's sister, in appearance and the way they said "Jack, I'm scared." That's maybe the reason why Jack has this attitude toward him.
Ship Tease: With Toothiana, especially at the ending of the movie.
A bit too with Bunnymund or Pitch, if you are a Yaoi fan.
Snow Means Love: When he becomes a Guardian, he is with all of his friends. You can see some snow falling around them.
Sympathy for the Devil: Despite being enemies, it's clear enough through Jack's expressions that he still empathizes a bit with Pitch's condition, probably because they shared the same condition as spirits. Even at the ending, when Pitch is brought back to his lair by his nightmares, Jack is the only one who is seemingly horrified by this.
Drives Like Crazy: To the terror of Bunnymund and the amusement of Sandy and Jack, North's sleigh has no seat-belts and rides like a roller coaster. And this doesn't even begin to cover North's actual driving/flying habits.
I hope you like the loop-de-loops!
Dual Wielding: He brandishes two large sabers. They seem to be linked to his magical strength in some way as he can only summon one while the children were losing belief the world over and was overjoyed (and surprised) when he was able to pull out a second one during the climax.
Magitek: Seems to be a master in the art, what with the quasi-technological sleigh, teleporting snowglobes and functional model ice planes. He also has this talent in the books.
Nice Guy: Despite being strict toward him, he is the one who's most supportive toward Jack and that's why Jack is heartbroken when North thinks that he betrayed him. In the rufftoon comic, he seems to be the one Guardian that Pitch may tolerate the most, and also the only one (along with Toothiana) who is willing to give him a chance for being a Guardian, even if Pitch immediately refused it.
Papa Wolf: He acts like this toward the others Guardians.
Parental Substitute: More or less this toward Jack. Played straight as Jack isn't shown having any father even when he was human.
Red Oni, Blue Oni: The Blue to Bunnymund's Red in the movie, although in the books he is much redder than him.
Storyboard Body: He has his Naughty and Nice lists tattooed on his forearms (and, considering the lengths of those lists, most likely over much more of his body). At the same time, having tattoos points to him being a Badass and Former Teen Rebel.
Teleporters and Transporters: His snowglobes act as these; just say the name of your target destination and throw them. He can also teleport between chimneys at will, though there's probably a range limitation to this one.
The Dreaded: It's not explicit, but check out the look on Pitch's face whenever Sandy turns up and his approach to fighting him; he avoids direct confrontation with him if he can, preferring to let his Nightmares do the work, and kills him with an arrow to the back when he's distracted. Sandy, at the very least, intimidates Pitch and, at the most, terrifies him.
Creepy Good: Shows minor signs of this when it is clear she has no idea how to cheer up Sophie. She tries to get her excited by looking at teeth, some with little bits of gum and blood on them.
Cute Bruiser: To the point that she punches Pitch in the face and knocks out one of his teeth.
Demotedto Extra: Subverted. She's not necessarily an 'extra', but she had a much bigger role in the early concepts of the movie, where she met Jack before anyone else did and was actually the only one in the group who never questioned him. Some artwork from the creators hint that she was also going to be kidnapped once or twice.
Fairy Sexy: Not in the traditional sense, but fans agree that her design is very beautiful.
Lightning Bruiser: When at full strength, she can literally rip through hordes of Nightmares at breakneck speed and punch Pitch hard enough to knock out a tooth. Though as she's de-powered for most of the film, she's more of a Fragile Speedster.
Mama Bear: It would be wise not to mess with her fairies. She has also some of this side toward the Guardians and other children, too.
May-December Romance: She had shades of this with Jack at the ending, even though they are both spirits so their ages don't matter anymore.
The Not-Love Interest: Subverted. She really has a crush on Jack (or at least on his teeth) and Jack is hinted having feelings toward her at the ending.
Parental Substitute: Even though she is implied to be the love interest to Jack, many people view her more like a motherly figure or a Cool Big Sis toward him. She acts even like a mother toward her fairies, children and the other Guardians, according to the artbook.
Race Lift: The Tooth Fairy is evidently vaguely South Asian in the books while in the movie, she's white. That said, she doesn't look that different from the design on the cover of her title book, where her skin is actually blue.
Ship Tease: She has several moments with Jack, most notably where at the end, she briefly gives Jack a hug and they share a Held Gaze before Baby Tooth cuts in.
Actually, she has some with nearly all the male characters in ROTG materials. For example, she holds Bunnymund's hand during Sandy's funeral. In one deleted scene, she was shown kissing North on a cheek (making this latter awkward) and Pitch slightly flirts with her in the official prequel comic.
Tooka Levelin Kindness: She wasn't evil in the books, nor was she mean, but she WAS a wielder of double swords who attempted to murder the monkey who killed her parents. In the movie, she's far more perky and sweet. Possibly justified, as the movie takes place many years after the books, giving her time to develop.
Vague Age: Gracious. The books state that she transformed at the age of 12, and apparently stopped aging in her 20's or early 30's, based on her illustrations. Her movie incarnation is even more vague, since she's the implied love interest of eternally-eighteen-years-old Jack Frost but is also considered to be very motherly to her fairies. She has to be at least 440, though, and was stated to be 'older than the mountains, but younger than the wind'.
Workaholic: She comments that, unlike North or Bunnymund, she works every night.
Adaptational Heroism: Even though he agrees to help the main characters in the books, he hates mankind because Pitch massacred his kind, making him the Sole Survivor and isn't very kind toward them. However, in the movie, he is shown having a soft spot for children (especially for Sophie) and is loyal toward North and the others. However, he's still an occasional jerk toward Jack.
Anti-Hero: Bunny is a complete jerk, although he deeply cares for his friends and children.
Big Brother Instinct: At the beginning of the movie, Bunnymund makes it obvious just how much he hates Jack. But despite this, he still sticks up for him, as shown when Pitch made a low blow against the boy.
There are hints he is like this toward Sophie, too.
Break the Haughty: Toward the ending of the story, when children stop believing in him.
Butt Monkey: While he's still very much a badass in his own right, Bunnymund does find himself as the butt of many of the gags in the film. And considering his frosty personality, it's hilarious every time.
Character Exaggeration: Of all the original Guardians, he shows the biggest changes between book and movie, going from a calm, technically inclined, chocolate hobbyist, to a slightly hot-headed nature warrior.
Defrosting Ice King: Bunnymund is very cold and aloof towards Jack for most of the film. It isn't until Jack proves himself as a hero that Bunnymund finally starts to show him genuine respect.
Depower: When Jack wasn't around in time to help the Guardians save Easter, children all over the world stopped believing in the Easter Bunny and it hit him so hard that he reverted to the size of a little rabbit.
Jerkass Has a Point: When Jack calls him a "kangaroo" and that the two began to argue with each other, Bunnymund says that he is the Easter Bunny and people believe in him; Jack doesn't know how to respond afterward.
Kick the Dog: He is so angry when he thinks that Jack could have betrayed them that he is the one saying that they should never have trusted him, breaking more Jack than he was already. However, this reaction was justified; he was heartbroken as well after all, and he takes it back once he learns that Jack got Jamie to believe in him.
His treatment toward Jack at the beginning can count too, especially when he said that people don't believe in Jack. However, that's also justified. His treatment was mainly due to a grudge he held because Jack made a blizzard in '68 during Easter. In any case, he goes better.
Tunnel King: Can travel almost as fast as Santa's portal-forming snowglobes, just by forming instant tunnels by tapping the ground with a foot. These tunnels can lead anywhere, even inside someone's house! They seal up once he (and whoever else is with him) enter, leaving no trace, except maybe a single blooming flower.
Adaptational Heroism: In one extent. In the case of his book counterpart, you only feel sorry for Kozmotis Pitchinier, the General who had been possessed by Fearlings and resulted in Pitch while book!Pitch is literally viewed as a monster who caused Bunnymund to be the Last of His Kind and also killed children, even though his actions were due to the Fearlings. In the movie, Pitch has some possible redeemable traits which makes him a bit more likable despite being still a Manipulative Bastard and a complete jerk. He was once a Well-Intentioned Extremist who used fear to protect children from danger (although in a harsh way) before turning into a Woobie, Destroyer of Worlds who suffered loneliness of not being believed in, which shows he has a true personality of his own. Much of his actions and massive Kick the Dog happened in the books had been apparently removed in the movie. It's however unknown if his backstory is incorporated in the movie-verse.
Ambiguously Bi: If his backstory where when he was human, he had a wife and a daughter is in the movie-verse. He also flirts a bit in the official prequel comic with Tooth during his introduction. Beside, in the movie, he never really got close to anyone else than Jack. In the Antarctica scene, he always claimed that he and Jack were the same, touching him when he proposed him to join his side (and in one of early artworks, he even strokes his jaw with a smug smile)and is hurt by his rejection. Furthermore, he even called Bunnymund "cute" for mocking him, making Bunnymund slightly scared (though Bunny was probably just worried Pitch might try to harm him).
Pitch: (laughing, genuinely) Look how fluffy you are! Would you like a scratch behind the ears? Bunnymund: (jumps in North's arms) Don't you even think about it!
That doesn't really help when you know he loves unicorns and wears cloaks or dresses.
Alas, Poor Villain: His actions are unforgivable and he deserved to be punished. However, you can't help but feeling sad for him when he isn't believed in anymore and when his Nightmares bring him back to his lair.
Bond Villain Stupidity: Pitch breaks Jack's staff, effectively rendering him powerless, then blasts him into a ravine. He then tosses the broken staff in the same ravine, allowing Jack to fix it and get back in the fight.
Combat Pragmatist: His strategy for dealing with Sandy? Avoid direct contact with him, use the Nightmares to distract him and fire an arrow in his back. Did you expect someone who moves through shadows to fight fair?
The Corruption: Pitch's Nightmare power came from years of converting Sandy's golden sand dreams into black sand.
Cuteness Proximity: Hinted when you see how he reacts in front of a little Nightmare as well as in front of Bunnymund in a small rabbit version.
Even Evil Has Loved Ones: He seems to care genuinely for his Nightmares and treated them better than he could do to anyone else in the movie. His Nightmare named Onyx (which is his pet) seems to be his favorite. In the rufftoon comic, the friendship between Pitch and Manny seemed to be quite genuine to the point that Pitch was angry when he thought that Manny cast him out. And obviously his daughter in the books.
Even Evil Has Standards: Arguably. Until he takes an interest in Jack and his powers, he doesn't physically attack Jack and even tries (in one way) to convince him to stay out of this conflict because he is a neutral party.
Evil Counterpart: Pitch is one to the Sandman. While Pitch delivers fear and bad dreams, Sandman gives hope and good dreams. They even use dust which reflect their color schemes and elemental powers. He's also one to Jack; they share the desire to be believed in and acknowledged.
Face-Heel Turn: In any case, Pitch was a morally ambiguous but good person who turned wrong. More significant in the books.
Fragile Speedster: Bordering on Glass Cannon. In battle, Pitch is swift and can deal out powerful hits, but he can't take many hits in return. Sandy is capable of knocking him around like a ragdoll during their fight and Toothiana was able to knock out one of his teeth with one punch.
Green-Eyed Monster: The reason why he hated the Guardians is because the Man in the Moon chose them over him, replacing him in children's belief. Invoked too, when Jack refused his offer to join his side.
Hoist by His Own Petard: After he's defeated and the Guardians corner him, his Nightmares show up. But seeing as how no one fears him now, they turn out to be his nightmares and promptly drag him off, kicking and screaming, back to his underground lair.
If I Can't Have You: In a certain way, he does this to Jack when he offered him to join his side. When he refused, he became angry and refused to give back Baby Tooth in exchange of his staff.
I Have Many Names: Pitch only calls himself as "the Boogeyman" in the movie. However, the application and others materials can show he has others names, such as the Nightmare King.
I Just Want to Be Loved: Or rather being believed, although the two reasons are closely joined. It's not clear what kind of "love" he searches for, but that may be likely Philia or Storge in his case.
I Surrender, Suckers: When Sandman utterly trounces him, Pitch pretends to give up before summoning a horde of Nightmares.
It's Personal: Maybe the reason why Pitch attempted a last strike on Jack in the finale battle instead of targeting the others Guardians.
Jerkass: Might be or might be not a Jerkass Fašade according to his vulnerable moments that he hides with his contemptuous personality.
Jerkass Has a Point: At the Tooth Palace, Pitch explains to Jack that being a Guardian is great, but there is a catch: if children stops believing in him, he would disappear. Unfortunately, that's true.
Jerk with a Heart of Gold: Maybe. The beginning of the prequel comic showed he wasn't entirely bad as Fear protected people. Furthermore, there was his friendship with the Man in the Moon in. However, the "gold" part disappeared very quickly.
Kick the Dog: A lot. Especially when he threatens Baby Tooth before breaking Jack's staff after this latter refused his offer.
He definitely came very far when he killed Sandy.
Lack of Empathy: Subverted. His kind of sympathy toward people sharing the same condition as he does is what humanizes him a bit. That doesn't prevent him to torture when he can and laughing at the pain of others.
Not Evil, Just Misunderstood: Played straight first then subverted. At first, he thought that Fear was important to people, and was a "necessary evil" to keep people safe. However, he is ultimately evil and just wants to create a new Dark Age where Fear rules the world.
Not So Different: Presses this angle with Jack, pointing out that they are both lonely spirits who want to be acknowledged by humans.
Pet the Dog: Or rather pet the Nightmare horses. He seems to treat them a bit better than he does to everyone else.
That may be often due to motivation; but there are hints which show that he seems to be more lonely than evil. First, until he joined the Guardians, Pitch never attacked Jack first because he viewed him as a neutral party and wasn't interested in him. The Antarctica scene shows that he seems to be still able to feel human feelings, and part of what he was saying to Jack wasn't a complete lie he made to convince Jack to join him; he seemed to really empathize with Jack's loneliness. When Pitch said he wanted a family, that was a real opening up he did to Jack, and didn't want him to be only his tool but maybe like a friend or the family he wanted to have. That may be also viewed as a Took a Level in Kindness, as he wants Jack thinking he is kind by showing him the Guardians never cared about him, even though he is the one who caused all of this.
Scare 'Em Straight: Supplemental materials created by one of the film's artists indicate that he was once a well-intentioned (if perhaps misguided) figure with this as his philosophy. This comic contradicts the books, however, so is probably Secondary Canon.
Spared By Adaptation: Kind of. The movie left his true origins unsaid. There are hints he may be a spirit like Jack, but the fact that he had been eaten by Fearlings and turned children into ones had been apparently removed.
We Used to Be Friends: With Manny apparently, according to the fact that Pitch calls him "old friend" every time he talks to him. It is shown in the comic which is a prequel of the movie and this friendship was apparently a genuine one. Seriously subverted, however, in the books.
When He Smiles: It is rare that he has a sincere smile. This only one moment is in Antarctica when he thinks that Jack understands how he feels to be alone.
Woobie, Destroyer of Worlds: Maybe. If his backstory from the book where he was General Kozmotis Pitchiner whose job was to guard the Fearlings on a prison planet, who tricked him into thinking they had his daughter and transformed him into Pitch is incorporated into the movie-verse.
In a lesser extent, there is also the fact that nobody believed in him, making him alone for a long time. It didn't improve when everyone believed and loved the Guardians.
Would Hurt a Child: He doesn't physically harm any children during the film, although wanting them to live in a state of constant fear is pretty harsh. However, at the climax, it is implied that he would have killed Jamie to deprive the Guardians of Jamie's belief, since Jamie had seen proof of the Guardians' existence and would not stop believing while he was alive. Either that or Mind Rape him to turn him into a Fearling, which is hardly better and some would say worse.
Yandere: Kinda. He wants to kill the Guardians for gaining the belief of children through fear. Furthermore, in a more explicit example whatever the exact nature, he attempted to Murder the Hypotenuse (in this case, Baby Tooth) when Jack didn't want to ally with him.
Pitch: You said you wanted to be alone... so BE ALONE!
His book counterpart has some Yandere shades too, but in a parental way.
The Chooser of The One: When Pitch begins returning to power, the MITM is the one who decides an additional Guardian is needed and selects Jack Frost. The other Guardians were created this way, as well.
False Friend: According to Pitch, he is this when Manny decides that fear isn't useful anymore and that he had to become a Guardian in the comics.
Figure It Out Yourself: This seems to be the case with him, particularly in his "interactions" with Jack. Also, he seems to have a very hands-off relationship with the Guardians as a whole.
Good Is Not Nice: He is definitely the Big Good. However, he chose to leave Jack alone during 300 years for a Figure It Out Yourself reason. Not really nice of him indeed, although his book counterpart is definitely nicer and more active.
Kick the Dog: Not really an example. He does everything to protect the children, but his treatments toward his Guardians are still a bit debatable, as he left Jack on his own alone for 300 years or never really helped them once in the story.
At least in movie-verse, though Pitch was the one at fault for rejecting the call of being a Guardian, Manny seems to have a part in Pitch's behavior, as he was the one who decided that fear wasn't useful anymore, which leads Pitch to think he had been shunned for this while he thought that the Man in the Moon was a friend.
The Speechless: No sound is ever heard out of him, but the Guardians and Jack all act as though they know what he's saying.
Melancholy Moon: The first scene when Jack describes how he awakened, feeling frightened and cold, as moonlight is seen through the ice.
Weird Moon: The moon is always full when the characters need to look at it. Then again, the Man in the Moon does have magic powers.
We Used to Be Friends: With Pitch apparently in the movie, according to the fact that Pitch calls him "old friend" whenever he talks to him. Their relationship is more shown in the official comic, and it is implied that Pitch really valued him as his friend. It ended when Manny stated that the Fear wasn't important anymore, which led Pitch to resent him and the Guardians. In the books, however, that's definitely subverted.
Jamie Bennett (Dakota Goyo)
Adorkable: The way he expresses his fascination with creatures he believes are real at the beginning of the movie qualifies him for this.
Agent Mulder: Believes more than pretty much any other human, including in things the others aren't sure about (like Yetis). Becomes the last believer by the climax, and then restoring the faith in the others.
When his mom offhandedly mentions Jack Frost, his instant reaction is to ask who that is foreshadowing his status as Jack's first believer and when Jack's fun results in him losing a tooth, he's sure it was the Tooth Fairy.
Badass Boast: To Pitch, and unlike Jack, he managed to back his up.
Jamie: I do believe in you. I'm just not afraid of you.
Morality Pet: To Bunnynmund, even if this latter isn't so bad.
Snooping Little Kid: How Bunny reacts to her being in his warren. She accidentally went through a portal, though, and is really just trying to have fun.
Cupcake (Dominique Grund)
All Girls Like Ponies: She wears a sort of tutu when playing in the snow, her room is completely pink, she has dreams about unicorns, and during the final battle, she confronts one of Pitch's Nightmares and turns it into a life-size unicorn made of dream sand. She promptly cuddles it and starts skipping away with it.
Her dream-unicorn is corrupted by Pitch into the first Nightmare shown; it's entirely possible that the one she transforms is the same one he took from her!
Hair-Trigger Temper: Getting hit in the back of the head by a snowball nearly makes her go ballistic. Thankfully, Jack managed to nip at her nose before she could crush Jamie with the head of her snowman.
Little Miss Badass: Fearlessly takes on the opportunity to protect the Guardians during the final battle.
Badass Crew: Everyone who works for the Guardians—the Yetis, faeries, elves, egg golems, and so on. While most of the faeries are captured early on, Baby Tooth proves they can still be awesome by herself.
Damsels in Distress: Almost all of Tooth's fairies are captured by Pitch and held in cages for most of the movie.
Satellite Character: Because we don't see much of her other than a flashback to Jack's life as a human, Jack's little sister doesn't have a defined personality other than being his sister.