J.S. Bach
He's best known as the producer behind the idol unit CLA:KLA, though fans tend to describe him in pretty grandiose terms—genius, transcendent, the whole package. The guy's got serious pull in the industry, which makes sense given that he basically runs Arke Inc., this massive music company that operates mostly out of the public eye. His influence is genuinely enormous.
What's weird about him is how he talks. He'll describe his actual intentions and plans using classical music terminology—saying things like "andante" when he means to slow down or change direction. It's either pretentious or genuinely how his mind works; people aren't always sure which.
Despite operating from the shadows at Arke, he's managed to build overwhelming public support for CLA:KLA, which is no small feat. There's definitely something magnetic about the guy, even if he keeps himself pretty mysterious.
Content compiled by AnimeList.moe from publicly available sources.