We really got to see his true character in Advent Children. He still had that cool, laid back guy feel that he had in 7, but in the game he really had no emotion to what was going on, hence forth, "doing my job." and killing thousands of babies, grannies, and puppies and kittens when he bombed that section of Midgar. :/ I liked him even then, but Advent Children really showed the true colors of that he did have a good side (I think a part of him is seeking forgiveness for what he did, even though maybe, JUST maybe, a part of him didn't want to) and a funny personality and still being laid back.
Look at all those and's. :0