Orochimaru's obsession with Sasuke was really creepy. I know he was just after Sasuke's body so he could have the Sharingan, but sometimes it seemed more complicated than that, if you know what I mean. That's what made Orochimaru interesting; he was insane and you never knew what to expect from him.
One of the reasons I liked Orochimaru is because of his creepy obsession with Sasuke. It was serious, creepy, but at the same time funny if you made it out that way. Plenty of people made Orochimaru's obsession into a gay thing and it was funny. When I first saw Orochimaru in volume 6 of Naruto (I didn't watch the anime much) I thought he was a woman. He had a woman's body back when Naruto, Sasuke, and Sakura first met him. Then again I thought Haku was a girl back then to...which they did on purpose. Man that was a girly boy. I sometimes still refer to him as she. Anyway back to Orochimaru I actually thought at one point Orochimaru would take over Sasuke in part 2 if only for a chapter or two. I knew it wouldn't last long as Sasuke really did become a much bigger threat even at the start of part 2.