Easily Finral. His battle against his brother (the first one), sealed it for me. Guy's great in my opinion. Probably one of the only guys I find myself laughing at when a gag with him pops up (especially that newer one with him trying to stay loyal to his fiancée) and I feel for him in his struggles against his family (not from experience or anything but still). Can't wait to see more from him.
I think Yami and Julius are cool. When I still watched the anime, I thought Yuno and Asta were pretty good but I don't like them as much now (not that they're bad or anything). William Vengeance and Zenon are also guys I look forward to seeing when I read.