[quote=Nightraider]
Be my guest. What 3 exactly however?Also, a question. What's the policy on introducing major NPCs (for example, in my case, new incarnations of the next set of Weapons from the Weapon Plus program) that have powers and the like? Basically our rogue gallery?
[/quote]

I think it's a matter of interpretation. You've got to wonder whether anyone would actually play the character. With DC games it's a little harder to judge because the Villains are just as interesting to play as Heroes. Possibly even more so, in fact. Here however, there's a definite hero bias. I mean, other than Magneto, Doom or a few of the Spider-Man villains, we're not really spoilt for choice. I suggest you weigh the magnitude and the range of the characters you propose to NPC. For example: I'm probably going to be NPCing Ultron. He's big in terms of significance, but is largely just a plot device. 

Were there any specific experimentees you were planning on? Wolverine's probably (definitely) out of the question, but I'd say everyone else would be fine.

Edit: The three before you mentioned Howie.