I'm anxious to check this series out, but I think that I remember the author saying that none of these characters are redeemable. I don't really see Boomerang as being all that irredeemable. He's a killer for hire (Or was, in the past. I don't know what's really changed.), and they're usually pretty easy to change or reform (Or at least retire.). Mostly, he seems to just get treated like a chump. I think that he can make for a bigger and more threatening Spider-Man villain than he's been. I don't see him as being all that evil or hardened though. BUT, I do think that it would be interesting to really get a look into his past. His origin just states that he used to be a famous baseball player, and that's rather vague. When was it explained that he took bribes and the like? I think that came from the Handbooks, not the actual comics themselves.