[quote=@ERode]
You'll probably also have a higher chance of people just going "ok my power's pretty good...AT ESCAPING THIS GAME SEE YA LOSERS" in the former scenario,
[/quote]

You're not wrong. I've been considering that myself, since many powers would be..... difficult to keep under wraps at higher levels. (Power to fly go brrrrr) They are superpowers after all. For that, I've been considering taking inspiration from media like Danganronpa where people trapped in the game have some form of blackmail/outside insurance forcing them to take part. I too enjoy characters who are self serving or have no sense of self preservation, so binding them to an external motivation might help things as well. 

[@Dark Cloud] It depends how many players everyone will play. Depending on how many people are interested, I'm leaning towards something like 6 players 2 characters each or 8+ players one character each. I'd like to avoid having to interact/kill off between your own characters as much as possible, so if we can roll with one character I'd like to have at [i]least[/i] 8 players so that the game has some depth. The maximum I'd likely consider is 12 individual players because that's the most I can imagine before it's far too crowded to sustain without dividing players up into groups somehow.