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