The Vampire Lestat?
Hmm... Just saw The Mortal Instruments & I guess thematically too it struck me that right at the moment Jamie would be perfect for this role. The Vampire Lestat is by far the best Annie Rice vampire novel in my view & Lestat a big charismatic character. I don't know anything about Jamie really, but can imagine him being interested in a (good!) version of this. It's a pretty sprawling novel, so maybe not suitable for a film, but if it were possible it could be wonderful since there ain't no character like Lestat!
Have seen Jamie in a few little things since Sweeney Todd but it was this recent film that made me think maybe he could do it..? I wasn't convinced whether he could pull it off, but I kind of feel that he possibly could now... I an imagine Lestat in him! What do you reckon? Would require a someone to make it though! He pretty much fits the description in any case. Maybe it quick though: Lestat in the book is supposed to be about 19 or something (not entirely certain) so would be nice to have him youngish. Though that's not usually how stuff works in cinema, I know.
Just a thought which has likely been here before!!