Muchimuchi Puririn was his handle name when he first posted Overlord on the website. Subsequently, he changed his pseudonym to Kugane Maruyama when Overlord got published; he didn't want readers to cast strange eyes when purchasing Overlord since Muchimuchi Puririn means "blubbery fatty".

His short story Dawn has been adapted in Kagetsu Tohya which is Type-Moon's sequel to their earlier doujin visual novel game, Tsukihime, released in August 2001.

Even Nasu Kinoko, the writer of Fate/stay night, praised his work but Maruyama gave up the dream of becoming a writer because he felt the difference in talent between Nasu and himself.

He is a big fan of the Dungeon and Dragons game. One of the reason he started writing again was all of his DnD buddies were too busy to play with him.