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Caliban might be the most useful, but I really would like to see someone like Jesse Bedlam.

So, since Scott has been resurrected by the Five, he shouldn't have that whole brain damage issue anymore, correct?
And if so, what does that mean? Will he be able to fully control his powers given...

I kinda wonder why it's being held in the most lawless place on earth. Then again, it may just be a ploy to make their real enemies come out of the shadows and reveal themselves. Emma's mind works...

My go-to as far as synergy has to be:
Phantazia + Siena Blaze + Jesse Bedlam. Slightly OP, but isn't that the point of any good Chimera?

My vote is for Jesse Bedlam. His powers are exactly what they need.

Bishop
Frenzy
King Bedlam
Tempo
Synch
Prodigy
M
Storm (Leader)

Her power set is dope. I'd love to see her on the team.

With all that Mutant DNA lingering around, Sinister is bound to lose track of some of it.

Using Non-Omega level mutants, combine three mutants DNA samples and create your own Chimera.