Violator III

Yes, Violet is aware she has an underbite. It's pretty bad. She's tired of hearing about it and kind of resents that people focus on it. Being born in hell, she is a melting pot of physical deformity. She also has generally asperous teeth, class 12 psoriasis, halitosis, severe osteoporosis, and lacks any gender definition. She's the stuff of nightmares and that is where she meets most of her friends. In most dreams, people tend to misrepresent themselves, and also forget what they dreamed. So Violet rarely recognizes her dreamers and vice versa, but they tend to hit it off really well.

Mothra -Revoltech

Unlike most flying animals/monsters/deities/meta-humans, Mothra does not take her gift for granted at all. She is shocked and overjoyed every morning when she wakes up flying 40,000 feet over the Pacific. She takes every opportunity to lift boulders, boats, and small villages into the sky in hopes that they may experience the same sense of exhilaration. She has as much fun diving in and out of clouds as you did jumping in and out of ball pits at Hardees, probably more. 

Her followers sometime call her Queen Mothra, though her actual status in the cosmic power structure is unclear (kind of like Lord Vader). She knows exactly what her place is, but it's hard to translate into a human concept.

Dilophosaurus -Jurassic Park III

Dilophosaurus's frill neck is indicative of her very outgoing, attention-seeking nature. She loves to meet new people and make friends. Her flamboyant appearance serves the double purpose of attracting curious, like-minded weirdos, while repelling the stodgy squares that can't deal with her subversive nature. Most people know of her from her heartwarming appearance in Jurassic Park, a role that won her the 1993 Oscar for "Best performance by a monster in a sympathetic role".

Jolt - ROTF

Jolt is a first generation cybertonian. In the pre-war days he worked as a door to door plasma-blade salesman. That experience sadly did not come in handy at all when Megatron started his insurrection. Thus Jolt came to America as a refugee. Earth television taught him two things, humans have a terribly unsophisticated sense of humor, and they are very hospitable to benign aliens. Unfortunately, Cybertron's distance from Earth meant that Jolt was about 30 years behind when it came to cultural attitudes. He had hoped he could more or less continue his way of life but everywhere he looked he was faced with prejudice as people told him that America used roads and he had better learn how to use them or go home. So he reluctantly transformed himself into a car in order to better blend in.  Also plasma blades are apparently a class 12 restricted substance so he had to find a new job (he's a Zipcar and occasionally delivers Pizza).

Tunnel Rat Sigma Six

Tunnel Rat is a member of Sigma Six. He really loves being a part of a team, especially his role which is infiltration and sabotage. He loves the thrill of being somewhere he's not supposed to be, something he experienced as a child sneaking into rated R movies. He's well versed in mechanical and electrical engineering as well as plumbing. He learns a lot from the things he has to destroy. Occasionally he is so awestruck with the ingenuity of an opponent's contraption that he will leave a note for them to tell them how much he respects them and what they might improve in the future so he wouldn't be able to destroy it. He writes these notes on his wrist-integrated labelmaker.

Gamera 1999

Gamera is a giant flying firebreathing sabretooth turtle. He used to be into making human friends but got disenchanted with them because they seem to hate the earth so much, he kind of loves the earth. He was born on this earth at the bottom of the ocean but all his family are dead, that's why he's the only one around.