I wouldn't mind seeing a Legionairre turn to the dark side, and becoming a regular threat to the Legion. That adage about power and corruption bears true all to often (bites tongue), and these kids are some of the most powerful. Maybe one of them should slip and fall, become less honourable and lose sight of the Legion and it's principles.
And rather than get redeemed or dying, I would prefer this rogue live to menace another day. Seeing a hero fall demonstrates just how tough it can be, and makes me appreciate those who don't that much more. Not only would it add another villain, but it would also be a constant reminder of the danger heroes face, of giving into their own urges like most humans are wont to do.
