A demon who gave up his own existence to merge with Silene, essentially sacrificing himself so she'd have the power to stand against Devilman. That's the core of his character—total selflessness in a pretty dark way. He didn't hesitate to erase himself from existence if it meant helping her out, which says a lot about what he was willing to do for her cause.
Content compiled by AnimeList.moe from publicly available sources.
