Badass Adorable: Especially in the series, where her job is catching and rehabilitating alien bio-weapons (albeit with help from her own alien bio-weapon and occasionally their creator). She even impressed Kim Possible during their crossover episode.
Berserk Button: Never call her crazy or say that she will never be like her mother.
Innocent Prodigy: Lilo can use the word "abomination" in the proper context, and reads books that not only contain atypical material for a child to read, but are far above her grade level as well. Despite this, she seems to have very little idea of what the consequences of her and Stitch's actions actually are.
The Lancer: Well, insofar as a six-year old girl can support a living weapon.
Mood-Swinger: Justified, as she is a very young child still dealing with the emotional fallout and other consequences of her parents' unexpected deaths, which are implied to have occured shortly before the first movie.
Morality Pet: Acts as one to Stitch, before he learns how to behave himself.
Ironic, since technically he's her pet. Their relationship is more like siblings, however, and she sometimes seems almost like a mother to him.
Nice Girl: Usually. She's still liable to make some silly mistakes like most children.
Not Good with People: Not even a little bit. With illegal biological, super-strength possesing experiments, however, she can socialize well with.
No Social Skills: In the first film and Stitch Has A Glitch, Lilo does not play well with others. Lilo is implied to have gotten in a lot of trouble— and run through a lot of social workers — before Cobra hit the scene, and she doesn't quite comprehend that Mertle and her friends don't consider her to be one of their chums. A subplot in Stitch Has A Glitchfeatures her struggling with, and gaining ahold of, her temper.
The Other Darrin: Daveigh Chase was unavailable for Stitch has a Glitch, so Dakota Fanning was hired instead.
All There in the Manual: According to a bonus short at the end of the film's video release, Stitch has been wandering around the Disney Studios lot since Snow White was released and behind the scenes, gaining a film of his own.
Becoming the Mask: In the movie, as he grows to love Lilo. The series sometimes focuses on Stitch learning about life on Earth.
Berserk Button: Despite being all action much of the time, Stitch is actually usually pretty laid back... until someone threatens to harm Lilo, makes Lilo depressed, puts Lilo in harms way - etc - at which point the wrath of a super strong and devilishly crafty super-experiment is usually imminent.
Breakout Character: Is easily one of the most popular characters, even getting his own anime series set some time after the films.
Genius Bruiser: Along with his super strength he's said to be smarter than a supercomputer.
Green-Eyed Monster: Stitch can get very jealous towards those he thinks are taking up Lilo's attention, most often when other experiments are - in his eyes - stealing the show away from him. And that's not even getting into his competitive streak...
Green Eyes: Stitch's eyes are actually ebony, but his part-synthetic constitution allows him to see in infra-green. They will change colour to show he's evil or malfunctioning.
Knight in Sour Armor: Lilo prays for an "angel" at the beginning of the movie. Cut to Stitch emerging from a crashed cruiser, looking anything but angelic. Turns out he's the very friend she needs in the world.
Meaningful Name: If something is ripped apart, like Lilo's life, you fix it with a stitch.
Nigh-Invulnerability: "Practically indestructable". He got run over by a truck. He has also been exposed point-blank to the extreme heat of an interstellar ship's thrusters, Jumba says what essentially amounts to a Wave MotionHand Cannonmight stun him (at best), and it turns out he can catch and handle the energy shots, he was at ground-zero of a gasoline truck exploding on top of a volcano, etc. This is practically his superpower.
Papa Wolf: Where Lilo is concerned. Not even counting his big rescue mission in the film, he goes on to get quite a few last minute saves and Big Damn Heroes moments in the subsequent films and series. Plus, see his Berserk Button.
The Unintelligible: Normally. He does speak some kind of weird alien language, which is strange considering that the others... don't. It can be assumed that it may be Kweltikwan, seeing as Jumba created him and Jumba is from said planet.
Wild Child: It's never specified whether Stitch has an age, but his behavior and manners are not unlike those of an extremely hyperactive little boy.
Cloudcuckoolander's Minder: Although she doesn't quite understand Lilo herself (both of them adopting habits to cope with their family's death) and is something of a stepford smiler herself, she is the only one who really knows what Lilo needs. However, it's evident she just isn't ready to be a parent.
Hair-Trigger Temper: Nani's known to have a bit of a temper. It was flanderized in the TV series.
Hidden Depths: While she appears like a typical, 18-something year old girl, the TV series has her show a keen interest in mathematics and chemistry. If not for her parental responsibilities, it's likely that she would have studied them. (In Hawaii, it is expected of teenagers to go to university).
Kid-Appeal Character: Inverted; she was made specifically to appeal to teenagers and young adults forced into her position. (Which is worryingly common in real life)
Lethal Chef: She is rather... famous for this. In the first movie, for example, when she makes a stew, she singes a part of her fringe off when she opens the pot, which does not earn points with the social services.. They end up ordering pizza that night.
Meaningful Name: Her name, "Nani", means both "beautiful one", and is also the last part of The Last Queen of Hawaii's name, "Liliuokalani", Lilo + Nani. This makes the song "Aloha Oe" much more tearjerk-y, as it's the Last Queen of Hawaii who composed it.
Neat Freak: Obbessively neat to the point where Lilo says Felix "Out Pleakleyed Pleakley"
Nervous Wreck: Is constantly anxious and jumpy. In the movie he is always terrified not only of Jumba but also that Jumba might hurt someone (especially Lilo, who he is very protective of, carrying her out of her about-to-explode house while Jumba and Stitch fight)
Card-Carrying Villain: Still claims to be an evil genius but is nowhere near as evil as he claims, however - more or less it applies to his love of twisting the laws of nature so far they fall apart, then putting the pieces back together in his image. A really Nice Guy, besides that.
Clark Kenting: As Pleakley's husband (when Pleakley's in drag) and Lilo and Nani's uncle.
Nani also doesn't seem to have time for a real boyfriend, since she's already struggling to keep a job and take care of her little sister. So while she seems to like David, she also knows she isn't emotionally available. They are, however, dating by the time of Stitch Has A Glitch.
Knight Templar: In the movie, he was really just trying to do his job, but took it a little too far. He also occasionally showed traits of this in the series, namely in "Splodyhead", where he outright claimed that he was the good guy and that Stitch was evil.
The Load: Only useful when it comes to sandwiches, everything else, haha, no.
Informed Ability: A justified version: it has been stated that he has all the same powers as Stitch, but he is never seen using them because, from the start, Jumba explains that he's also a lazy coward. Finally ended in Leroy & Stitch, when Lilo finally convinces him to get off his lazy patookie and do something for himself.
Shaped Like Itself: Many of his "insults" are just saying exactly what the person he's talking to is in an insulting tone of voice. Like "you Grandcouncilly Woman with your large pointy collar!" or "you oh-so-adorable little Hawaiian girl!"
Hate Sink: Mertle only exists as an unsympathetic bully who repeatedly kicks the dog by insulting Lilo and her mother, so that viewers can hate her.
Jerkass: Oddly it comes more from being spoiled than from her upbringing. Her mom is actually very nice.
Surprisingly, this might relate to the Hawai'ian concept of the ha'ole — That is, a mainlander who acts like a stereotypical Hawai'ian tourist, considering she's, well, in a minority.
Kick the Dog with slight Pet the Dog: Arguably. Mertle outright tells Lilo that as a dancer she will never be anything like her mother. Granted, Lilo had every right to react the way she did considering it was reasonably offensive, but it could also be that Mertle had some amount of respect for Lilo's mother.
Never My Fault: In one episode, she gets a charm bracelet with an experiment pod on it. Lilo tells her not to get it wet because it contained Holio (#606), who has the power to transform into a black hole. Not believing her, she purposely activates it and has her house eaten by it, and she blames Lilo for the whole fiasco.
The Other Darrin: She was voiced Miranda Paige Walls in the original film and Liliana Mumy in all other appearences.
People Puppets: Was used as one by Hamsterveil in one episode via a mind control device. Oddly it couldn't override her disdain for Lilo, which Lilo managed to use to incapacitate her.
Rich Bitch: Supposedly, she certainly acts like it and her mom throws some rather lavish parties for her.
Spoiled Brat: Preseumably because her mother always dots on her.
Nice Girl: She's one of the few girls who try to get along with Lilo.
The Other Darrin: In her first appearance, Victoria is voiced by Daviegh Chase, which lead to Talking To Herself with Lilo, and in her second appearance, Alyson Stoner voiced her.
Van Helsing Hate Crime: "Snooty" had her doing this since she didn't know about the experiments and Snooty was constantly flying at her. Turns out its a "Snot Vampire" and was attracted by her sinuses. Once Victoria realized it was harmless, she changed her tune.
Voiced by: Tia Carrere
Mertle's mother, only appears in the TV series. Quite the opposite of her daughter, as she sweet and kind to Lilo.
Reasonable Authority Figure: Despite not being tolerant of repeated failure, she's only trying to do what's best. However, she can and will use loopholes to go against what the council has decided if it's the right thing to do.
Well-Intentioned Extremist: She proposed that Earth be gassed when Stitch landed there, but was stopped by Pleakley, who claimed that Earth was a protected wildlife reserve for mosquitoes.
You Have Failed Me: The Galactic Federation has an extremely low tolerance for failure - when she has to show up and take care of things herself, the whole scene is her firing and prosecuting everyone who failed with extreme prejudice.
Brother-Sister Incest: Although the Experiments are referred to as Stitch's "cousins", if one were to actually think about it in technical terms, since Jumba is their creator, it makes him their father.
Cute Monster: Not that the other experiments aren't cute themselves, but her body is somewhat more humanlike and we see very few females.
Manipulative Editing: Due to her being reformed, Reuben had to trick her into singing to him (he and Stitch are the only experiments unaffected by her singing) so that he could record her voice and play it backwards, turning the experiments tamed by Lilo evil again.
Satellite Love Interest: To an extent, the main reason she was introduced was to give Stitch a love interest. Funnily enough, while Stitch was sad and miserable about leaving Lilo behind in Leroy & Stitch, he didn't once think about Angel until he saw her at the end of the film.
The Lilo/Stitch shippers had a field day with that one.
Voiced by: Amy Hill
An old Japanese lady that runs a fruit stand and owns a large number of experiments as pets.
Running Gag: Something making him drop his ice cream before he gets to eat it.
The Voiceless: He's only spoken twice: once in the Comic Zone comic "Sue-Whatsi?!?" ("I don't see any giant wave"), and once in the Lilo & Stitch: The Series episode "Babyfier" (yelling when he trips over Babyfier's pod and crying after Babyfier turns him into a baby).
Voiced by: Chris Sanders
An evil version of Stitch created by Jumba, under orders of Hämsterviel.
Flat Character: Being Stitch's Evil Counterpart is all there is to Leroy, as despite the fact that he is one of the main antagonists of Leroy & Stitch, he does not get any character development. You could almost take him out of the movie and replace him with Stitch clones, since he doesn't contribute much despite sharing the title with Stitch.
Balloon Belly: Frenchfry (#062) can make delectable meals from almost any foodstuffs, but the resulting meals have absolutely zero nutrition, making the consumer feel like they are never full. They eat and eat until they have swelled up to massive size, then Frenchfry cooks and eats the enlarged individual.
Crippling Overspecialization: A common weakness for Stitch's cousins; they're usually made for one purpose and one purpose only, making it impossible for them to put their talents to use for anything else. For example, Slugger (#608) can play baseball because of his power to deflect incoming projectiles. However, he cannot play basketball for the exact same reason.
Everything's Better with Dinosaurs: Some of the experiments have traits of dinosaurs; Richter (#513) resembles an ankylosaurus and Slugger (#608) resembles a pterodactyl, for example.
Evil Counterpart: Experiment 627 (has all of Stitch's strenghts but none of his weaknesses).
Expy: Babyfier is a fairy version of Mew with a baby theme and the cuteness turned Up to Eleven, down to sharing the index number 151. Even its whole concept draws a parallel with Mew's representation of an animal fetus.
Muck Monster: Ploot (#505) is a variation, he's not an actual blob of pollution, but he instead absorbs trash to grow larger and can flood entire cities by transforming his collected garbage into black sludge.
Mundane Utility: Lilo tries to find a place where an experiment can use its ability for good.
In fact, the 0-Series was created for testing and/or household purposes.
Neat Freak: Felix (#010), to the point that he considers anything to be trash, and any living thing to be a germ.