Oh, how I wish there were a simple answer for this. I have so many influences that I tweak here and there to make my characters that it's difficult to pin-point one or two. Because of that, I also find an extreme amount of trouble in finding a character that is similar. X'sato is like so many characters, yet different in so many ways. I suppose, if I had to choose one character that he was the most like off the top of my head, I might be stuck with... hm...
Jin-Ho Myung, the protagonist of Unbalance x Unbalance (its a manwha, and a fantastic read). They're both driven to accomplish their goals, both are awkward at times, both face the challenge of questioning their direction, and both fight tooth and nail for what they believe in. I know that list is kind of a cop out because its extremely vague, but drawing comparisons is not my strong suit. Their personalities are similar, but not too much. Maybe just enough to say "similar".
Jin-Ho Myung, the protagonist of Unbalance x Unbalance (its a manwha, and a fantastic read). They're both driven to accomplish their goals, both are awkward at times, both face the challenge of questioning their direction, and both fight tooth and nail for what they believe in. I know that list is kind of a cop out because its extremely vague, but drawing comparisons is not my strong suit. Their personalities are similar, but not too much. Maybe just enough to say "similar".