I think the translation of Yu Yu Hakusho is something like this: The first "Yu" means playful, the second means ghost (and is the same as the "Yu" in "Yusuke"). The "Hakusho" literally means white paper, but referes to a government report. "Playful ghost" gets translated to "Poltergeist", thus: Poltergeist Report. Not that I actually know Japanese, I'm just remembering what I've read. I'm a Yu Yu Hakusho geek.
Kurama would be my favorite. He's so...subtly psychotic. Polite, collected, cares about his friends, but psychotic nonetheless. I totally want to be him. And Hiei is adorable (as is his sister - I adore Yukina). Love also for Yomi, Shura, Hina, Yusuke, Shizuru...most of the cast. Except for Sensui.