Artist. He has two nicknames.
Name(1): η²ηΆζ (Ryuujouhan, lit.'granule')
He uses this name on Pixiv and 'Touhou SouSouWa,' a bulletin board for Touhou-related fanfic novels.
Name(2): ζ ηͺθΌ (Madara Inosuke)
He uses this name on his webpage(closed) and Twitter.