Remnants/Characters

The Eighty

Jobs

Audience Surrogate: He's the first viewpoint character and retains the POV for most of the first book. Also, he has a much milder personality, not to mention being saner, than most of the other prominent teenagers except perhaps Violet.
Geek
Not Good with People: He's much better with machines.
Playful Hacker: On Earth. The talent doesn't find as much use afterwards.
Promotion to Parent: Tries to take on this role for his little brother Edward.
Sesquipedalian Loquaciousness
Teen Genius

Mo'Steel

Awesome McCoolname: He's not sure if it's short for "More Steel" or "Man of Steel". His real name, Romeo Gonzalez, is pretty cool too.
Boisterous Bruiser
Good with Numbers: He instantly converts the number of minutes they've been in stasis to years and days. Basically, he's a mathematical Genius Ditz.
Le Parkour: Not referred to by name in the series, but he's essentially a traceur, presented as one part of his general enthusiasm for extreme sports.
Static Character: Mo changes very little over the course of the books, despite being one of the main characters.

2Face

Broken Bird: We don't hear much about what she was like before the fire (and considering the implications that she started it herself, she was probably far from a Yamato Nadeshiko) but it's suggested that the experience hardened her considerably.
Dark Action Girl
Eyes Are Unbreakable: She can see just fine out of the eye on the scarred side. It's possible that that eye did get blinded and it was repaired or replaced in the other reconstructive surgeries she had after the fire, though.
Fallen Princess: She used to be pretty and popular. After the fire that burned off half her face, not so much.
Gray Eyes
Nerves of Steel
Scars Are Forever: She was all lined up to get restorative plastic surgery -- she didn't mind being 2Face, but only temporarily -- before The End of the World as We Know It happened.
Tall, Dark and Bishoujo: Or she was before she got half her face melted.
The Stoic: She doesn't act completely emotionless, but she's rather lacking in good feelings and is frequently described as cold.
Two-Faced: Duh.

Violet Blake

Badass Bookworm
Bad Powers, Good People: Has one of the most disturbing abilities in the series, but is still a very kind person.
Elegant Gothic Lolita: A rough equivalent; the Janes style themselves after adult Victorian women rather than children, but both are very keen on elegance and frilly dresses.
Fingore: Loses her right index finger in the second book.
Lady And A Scholar
Lady of War
Last-Name Basis: She originally chose to be known as Miss Blake, with Violet as a fallback nickname. Most of the time she's just called Violet, or Violet Blake.
Miss Exposition: She knows all about art. This is helpful when you're in a world made from paintings.
The Ojou: Several of the characters are from rich families because of how the Eighty got their berths, but Violet acts the part.
Our Vampires Are Different: Her abilities are related enough to this, given that the worms are pretty much indestructible.

Billy Weir

And I Must Scream: Billy's consciousness doesn't shut down when he sleeps (for some reason), and that extends to the "sleep" induced by suspended animation. So he spent five hundred years immobile, alone, deprived of all sensory input. This eventually slowed down his sense of time so much that he was catatonic for a while after the survivors woke up.
Black Eyes
Blessed with Suck
Curtains Match the Window
Eerie Pale-Skinned Brunette
Go Mad From the Isolation: While stuck in And I Must Scream for five hundred years, he went mad after less than a year. Then eventually back to sane. Then mad again, and continued to flip-flop until "the definition of madness became irrelevant." Eventually his brain went so nuts, that he started reading people's minds just to have something to do.
Looks Like Cesare
Older Than They Look: He's 14 but he looks like he's about twelve, maybe younger.
Oracular Urchin: He's actually the same age as the main protagonists, but, as mentioned, looks younger.
Photographic Memory: At the start of the series, he can remember everything that's ever happened to him, but mostly just while dreaming.
Psychic Powers: Even before he left Earth and got Touched by Vorlons, he had them. The first time we see him dreaming is like a trailer for the rest of the series.
The Stoic: Billy was practically an Emotionless Boy growing up on Earth, which is the main reason why people called him Billy Weird.
Strange Boy: Billy Weir. Before they even left Earth, he was known as "Billy Weird". And then It Got Worse.
Touched by Vorlons

Yago

A God Am I
Ambiguously Brown: He's actually mixed-race, with a white father and a mother who's the first African-American president of the United States (the series was written in 2001), but his skin tone is perfect for this trope.
The Beautiful Elite
Claustrophobia
Complete Monster: Your Mileage May Vary on when exactly he crosses the Moral Event Horizon, but he certainly has by the end of the series.
- Though after being eaten by Tate's "The Mouth" mutation and his mind having to share with hers, he's her ally. It's not really a Heel Face Turn, as it's about his own survival as much as hers.
Enfant Terrible: He's a bit old to count during the series, but he was always a sociopath. When he was thirteen he told a news anchor that his goal in life was to become "feared."
Entitled Bastard
Eyes of Gold: He's got gold eyes, spliced with cat DNA so they reflect light and appear to glow in the dark.
It's All About Me: The size of his ego defies belief.
Jerkass
Pride: He's practically the embodiment of pride.
Royal Brat: He's the son of the US President. He mentions this quite often.
You Gotta Have Green Hair

Shy Hwang

Despair Event Horizon: Slipped over it when his wife died.
Extreme Doormat