Hmmm...what I like about Touma is that he doesn't give up in any situations even when odds are highly against him. In addition when his anti-magic right hand always gives him a bad day everyday.
By the way, after listening and watching a few voice acting samples and scenes of Johnny Yong Bosch, I am completely convinced (as well as from MrTerrorist) that Johnny Yong Bosch is a second candidate to voice this character for an English dub if James Arnold Taylor can't voice Touma for legal reasons. Of course, I would rather have Bosch voice Accelerator instead of Touma.
BTW, I'm planning to start a character sheet of To aru Majutsu no Index in TV Tropes. If anyone can describe Touma with tropes from TV Tropes, It would be a great gift.