I got the impression that mettle, hazmat and striker had all been pretty well off. Reptil is cool, I feel like he get's overshadowed too much by the kids that like to be criminals. I think i'm also annoyed by some of the writing in the book. THese kids weren't raised to be killers. WHen they beat up the hood, they knew exactly what they were doing, they're not learning it's bad now.
I only stuck hazmat out as expendable. I like most of the other kids. I was more talking about their backstories as examples of ones i found pretty lackluster or uninspired.