Masayuki Rudra Nam Ul Nasca (マサユキ・ルドラ・ナム・ウル・ナスカ), or Masayuki Honjou (本城正幸).

He may seem like he was built to be Rimuru's archenemy, but ended up becoming one of his closest allies instead.

I'm surprised no one made any bot about this guy, so I'll start. Let me know how I can improve upon this bot.