Kaname a nice guy? I don't think any of those vampire nobles ever were nice guys, the purebloods least of them all. They all seems to have enemies even within their own family. Kaname, I think, might have been a nice guy had he not been born a pureblood, but as he is, I think he's anything but. Very manipulative and scheming. He genuinely likes Yuuki, for sure, but at the same time I think he believes he totally owns her as well.