Greetings, JSW! I'm LunarSage, one of your friendly neighborhood GMs!
Thanks for stopping by with your interest. We'd love to have you play with us, although we're going to have to say no to at least one of the two characters you've proposed... mainly because the characters were introduced far after 2000, which is where this setting's continuity lies. None of the major events that happened post 2000 in the comics have occurred in our setting. That means no newer New Mutants, no Planet Hulk or World War Hulk, no House of M, no Decimation, no Civil War and no Avengers vs X-Men. Cain Marko is still Juggernaut rather than Colossus, Jubilee has her powers and is not a vampire, there are still plenty of mutants in the world, Genosha is still run by the original government and Jean Grey is alive and well with no real connection to the Phoenix other than that the entity masqueraded as her for several years while her body healed. So since Prodigy's history so heavily depends on post 2000 events, he just wouldn't fit in this setting. Cho I'm not super familiar with, but the Wiki says he first appeared in 2006. My gut says to say no, but if you can convince us that his origin and early history isn't heavily reliant on post 2000 events, we may consider it.
Who else were you interested in?
Well, his introduction to comics did come in 2006, but there isn't anything that ties him to that time period. In fact, he was kinda written to be a more 'classic' hero, with his first issue being in 'Amazing Fantasy #15' (volume 2).
And backstory-wise, the really 'Important'(1) arcs for his character are:
*His Introduction- His first arc has him winning a quiz show and discovering that he has a 'hyper-mind' (Basically, his brain works like a super powerful quantum compute) and is 'The seventh smartest man in the world' (Whether or not that is accurate is a point of debate, even in universe)
*Strong man Bros- He meets the Hulk and feels a kinship towards the jolly green giant, even going so far as to team up and protect each other. He also meets some of the other 'team hulk' members (She-hulk, Hercules, etc)
There are events in his backstory that are post 2000 events, world war hulk being the largest, but I don't think they define him as a character any more than No More Mutants defines Wolverine as a character.
To me he's just someone with a cool power, a snarky attitude, and who routinely gets in over his head (2)
(1) - The arcs that I would actually use while wring and playing the character.
(2) - Like I said, he was designed to be more 'classic' marvel character (By which I mean spider-man)