I'm looking forward to more Accelerator + Chibi-Mikoto personally.
I like Touma, because he's just kind of a guy - he doesn't really have the terrible back-story or particular poignant motivation they seem to force on shonen heroes, he just gets dragged into situations through his conscience to the point that it becomes a joke in itself. And I like the imagine breaker idea, it's not a flashy ability but it makes for interesting fights, since he can never just have an easy win.