Wander is the main character of the show. He's a little orange furry guy who wants to befriend everyone he meets. Sylvia is his best friend, and the feeling is mutual. Wander's personality drives him compulsively to be helpful. This often gets him (or Sylvia) in trouble, but usually his kindness is repaid in the end, as whoever he and Sylvia help end up grateful and cheerfully willing to repay the help in kind. Wander's personality flaw is that he tends to get too caught up in things, and as a result often forgets about and neglects Sylvia's feelings. But he's nothing if not sincere, and once reminded, makes the effort to do better by her.
The Ace: Albeit one who doesn't seem to notice that he's the ace, or would even care if he did.
Attention Deficit... Ooh, Shiny!: In "The Prisoner", after outwitting and evading Peepers for the entire rest of the episode, he manages to get tricked into a cell because he can't resist following the glowing dot from a blaster's laser sight and trying to catch it.
Badass Pacifist: As demonstrated in "The Troll" in which he defeats the titular Jerkass by simply kicking back and ignoring his insults.
Beat It By Compulsion: Obessive-compulsive type. He's incapable of not being helpful, even when it's against his best inerests. The Watchdogs exploit this in "The Fugitives" to get him to reveal his locations. In "The Nice Guy", his need to be helpful keeps him from getting a drink Sylvia wants, which causes him a lot of distress.
In "The Greatest," he wolfs down lots of hot dogs for a contest (against Lord Hater).
In "The Lonely Planet" he sure puts away a lot of pancakes, and pie— so much that he looks pregnant by the time he's finished.
In "The Tourist" he wolfs down the Galaxy's Biggest Hoagie before Sylvia even gets to take a bite, depriving her of dinner.
In "The Day", he sleeptalks of glowing red cookies and evil pineapple kings, and Sylvia puts strange food-related dreams into his head, such as pie monkeys needing ballet lessons, cheese towers turning into narwhal bacon, and three noodles considering buying pleated khakis, to name a few.
Big Good: "The Little Guy" indicates that Wander and Sylvia are this without even really trying to be, or at least that Hater thinks they are. Simply by spreading good and kindness around wherever they go, the two of them have become a force for good that's singlehandedly thwarting Hater's plan to fill the universe with "fear and hate." According to Peepers, Hater believes that the only reason good still exists in the galaxy is because Wander still exists - hence the two of them being public enemies #1.
Cannot Keep a Secret: In "The Picnic", he accidentally (and very loudly) blabs about the embarrassing bodily functions of Sylvia's species to Lord Hater, Emperor Awesome, and their entire armies.
The Fool: Seems to have shades of this, although Craig McCrackenhas hinted that he is actually pretty clever. This "foolish cleverness" shows somewhat in "The Greatest," where rather than being dimwitted it seems more like he just doesn't care about anything but enjoying life, not even an army of evil minions. He's able to use his brains and his friendliness to convince Hater's army go AWOL and go to a fair, defeat Hater's right hand man with excessive fun, and trick Hater into overcompetitive-ing himself into a meltdown... and the whole time never quite seems to grasp what Hater was actually trying to do.
As a general rule, Wander's savviness varies with how idealistic he's feeling. When blinded by cuteness, as seen in "The Egg" and "The Pet" he tends to put himself and others in danger. When he's up against something he knows is dangerous, like Lord Hater or The Troll, he's more in control of his ditzy tendencies, though sometimes that can backfire on him too, as seen in "The Bad Guy."
Fragile Speedster: As demonstrated in "The Fugitives". He's very fast and strong, but he was easy to catch in that episode.
Fun Personified: He's a Nice Guy with the amazing ability to have a good time wherever he goes. By way of this alone, he is able to defuse Hater's villainous machinations without antagonizing the guy at all.
Heroic BSOD: He suffers of a brief one in "The Fugitives", when he finds out Sylvia abandoned him and the Watchdogs caught him when he was helping people. It takes him smelling a stink coming from a manhole and Sylvia's arrival to snap him out it.
He has another one in "The Good Deed" when after another failed attempt at helping someone causes a missile to launch toward the sun. Wander lets himself sink into a mud puddle until Sylvia snaps him out of it.
Idea Ding: Wander makes the ding himself whenever he thinks of something.
Idiot Hero: In some episodes. In others, he seems more oblivious than stupid.
Obfuscating Stupidity: Wander is actually more than clever enough to outwit the villains he faces without even trying, but even while he's doing it he seems like a fun-loving, oblivious goofball. There are a few times he visibly drops the act for the audience and lets on that he really does know what he's doing, but it's rare enough that it's easy to mistake him for The Fool.
Pint-Sized Powerhouse: In "The Greatest" he's able to best Hater (who is at least three or four times his size) in every single competition they try - including pushups, a "ring the bell with the mallet" puzzle, and arm wrestling (in which he accidentally breaks Hater's arm off.)
Unknown Rival: Wander doesn't even seem to be aware that Lord Hater... well... hates him, and actually remembers their encounters favorably. Doesn't appear to be the case with Sylvia, though.
Subverted with "The Fugitives." He appears to at least be aware of Lord Hater's danger.
Weaksauce Weakness: Put him face to face with an evil dictator and his minions, or some bloodthirsty monster? No problem, he'll just annoy them into submission. But put him in a situation in which he needs to resist temptation...
Wholesome Crossdresser: Possibly. He briefly dresses up as a woman in "The Greatest" and "The Good Deed" and in "The Fugitives," he seems a little TOO eager when Sylvia asks him to play dress up.
Sylvia is a member of a beast of burden species called the Zbornak. We don't know yet if any of the others have her sentience or her aggressive temperament. What we do know is that she and Wander are inseperable best friends, and that Sylvia feels protective of him. She also has an appetite as big as her heart; and a temper as big as the galaxy. She's not quite as fun-loving as Wander is, but she tries to be patient with his antics, and indulges him lovingly until she is too tired or stressed to go on.
Big Eater: In "The Fancy Party" she spends the whole party stuffing herself full of finger sandwiches.
Bizarre Alien Biology: Her species has a slow metabolism/digestive system, and thus it takes them longer than most to use the washroom. Fortunately, they only have to do this once every five months.
Bizarre Taste in Food: Sylvia loves Slarnak's Deli's Jellyfish Pie, but Wander gags at the mere mention of it — and a comparatively tiny slice is enough to make a giant monster upchuck her and Wander off-planet.
She Cleans Up Nicely: Played with. Sylvia is well aware she's not conventionally beautiful (as mentioned in "The Day") but she made the effort of formal dress for "The Fancy Party" by adding a string of pearls. In "The Party Animal" she puts on makeup and clothing befitting Emperor Awesome's dress code and looks terrible in it.
Tomboy with a Girly Streak: Spas seem to be her soft point. In "The Ball", she really enjoys herself at one and brings up rebuilding it in her list of things the Balzarians need, and in "The Tourist," she briefly squees over the fact that a hotel they're staying at has one.
Lord Hater is one of several villains in the universe. He seeks to take over and rule the universe, filling it with hate and fear. To aid him in his goal are his major domo, Commander Peepers, and the army of Watchdogs. Hater tends to talk a good game, but has a lot of behaviours in common with an awkward teenage boy.
Badass: During the last part of "The Picnic" - this is a guy who, in a towering rage, demolishes an army, takes down a dinosaur single handedly and punches a guy through a planet. This makes his total inability to do anything about Wander that much funnier.
The Dreaded: He might be a depicted in a comedic fashion for the most part, but a good deal of the galaxy is justifiably afraid of him. Wander and Sylvia only oppose him as often as they do because they fear him slightly less than the rest of the cosmos.
Freudian Excuse: Claims to hate the color purple because a girl he asked out on a date while he was in high school, who just so happened to have purple hair, turned him down. He's gone out of his way to destroy entire planets for just being purple.
Commander Peepers is the highest ranking leader of the Watchdogs. He runs all command operations, comes up with plans for Hater's invasion forces, and tries to assuage Hater's feelings when Lord Hater has been frothed into a rage by Wander or by anyone else. It rarely works, but Peepers is nothing if not devoted to his job.
A Father to His Men: Possibly. Shown in "The Pet" when Captain Tim attacks the Watchdogs and all the the army seeks shelter hiding behind him, to which Peepers does not object.
Subverted in "The Bounty" when he purposefully harms Watchdogs during his speech regarding his own competence, and also in "The Little Guy" when he is all too willing to leave the least effective Watchdog, Westley, behind.
Supported in "The Little Guy" as he readily remembered not only Westley's name, but how long he'd been a Watchdog.
Supported in "The Day" when he feels he has to remind a member of the army to say 'thank you' for aid in pressing an elevator button.
The Chew Toy: He exists mainly to be Sylvia and Hater's punching bag.
Cute Is Evil: Think he's cute? Watch "The Bounty" and see him bully the other Watchdogs in a futile attempt to make a point to Lord Hater, zap a game attendant who gives him a doll, lure one bounty hunter into an enclosure with a vicious animal, and slice another bounty hunter in half from the inside outusing the blade on top of his helmet.
The Only One Allowed to Defeat You: Will not let anyone else capture Wander and Sylvia and allows Lord Hater to finally rule the universe, which causes him to stop bounty hunters from doing just that. Ironically, he allows Wander and Sylvia to escape and get into even more trouble with Lord Hater.
Army of Watchdogs
The watchdogs are all the same eyeball-headed race that Peepers comes from. They seem to be mellow little guys when they're not directly under orders to destroy, blow up, or invade.
Friendly Enemy: Wander is surprisingly effective at befriending these guys when he wants to. May overlap with Punch Clock Villain, as both times he did so was while they were on break (though the first time, he was able to convince them to take said break while they were supposed to be in the middle of plundering).
Invisible Anatomy: In "The Greatest" we see a few licking ice cream cones, without any visible tongues.
Westley was the smallest Watchdog recruit, and was generally ignored or kicked around by the rest of the Watchdogs, including Commander Peepers. After meeting Wander and Sylvia and getting to know them a bit (which included saving his life on more than one occasion), Westley captured the pair, then thought better of his deed. He faked his own death to let them escape and has gone wandering off on his own since then.
Faking the Dead: He made it look like he got blown into space trying to prevent Wander and Sylvia from escaping Hater's ship.
Genre Savvy: Westley knows enough to realize that if he hadn't faked his death, Hater would probably hunt him down second in priority to Wander for letting Wander and Sylvia escape.
Agent Peacock: He's a flamboyant shark-man thing who enjoys tanning and wearing lipstick; he also rides a fire-breathing dinosaur that can also shoot lasers from its eyes in combat and controls a entire legion of "Fist Fighters". He's earned his title, alright.
Dissonant Serenity: Okay, who talks about their whole race running out of fuel and dissolving into cannibalism after the destruction of their planet in such a calm voice and with such a big bright smile on their face?!
Seen It All: Of the "weary traveler" variety. A giant dog destroyed their planets and forced them to move so many times, she and her people have become apathetic towards it, calling it routine.
The Stoic: Beeza and the other Balzarians accept that Buster repeatedly destroying whatever planet they're living on is just the way things are.
Wrong Genre Savvy: Thinks he's the hero of a fairy tale destined to save the princess and wed her. In reality, he's a Stalker with a Crush who lives in delusion because he couldn't take no for an answer. On top of that, he manages to mistake the actual hero for the Sidekick, the Sidekick for the Cool Horse, and the princess' true love for the Big Bad, and refuses to budge from this construction no matter how obvious it becomes that he's got everything wrong.
Genre Savvy: Unlike the Wrong Genre Savvy Brad, who thinks life is like a fairy tale, Demurra is smart enough to learn how to avoid tropes associated with them. When Brad kidnaps her, she proves to be competent enough to knock him down and save herself.