Like Vanisher,Elixir but my favourite is Mercury, I don't understand why she is never a member of this current X force .She is a living weapon almost invulnerable.I would put her on a superior footing than x-23.Mercury is incredibly underrated.If I had a mutant that I'd want to fight alongside it would be her most definitely.Hope the writers of Xforce include her in the team,toughen up her backstory and you have a super soldier