That's an interesting idea. I'd love to see an important character like a gym leader or elite four member turn rogue.
If that rumour (the one with the gym types, which seems credible) is true, then we'll definitely be seeing Fairy as the second gym (Lumiose City gym?). I was thinking it would be neat if we got an 'unofficial' Fairy Type Champion. You know how Alder was sort of like an unofficial Bug Type Champion, since he had 3 Bug Types on every single team he used (BW, B2W2, PWT), maybe we could get that with the Champion, but 3 Fairy types, and then 3 wildcards. That's the same formula that Lance, Iris and Steven all used with their teams as well, except they were explicitly stated as specialising in their respective types, which Alder wasn't. Caitlyn for Champion anyone?
Hell no, I don't want another one like Iris ever.
I want the champion to look and act wise and respectable. I would also like no double typings on the team, so that their team can be as diverse as possible.