Artist. Formelry tagged as mizu_youkan.

Japanese name: 水羊羹 (Mizuyoukan or Mizu Youkan)
Old name: 水ヨウかん (Mizuyoukan)

g4.See also

• Pixiv account: http://www.pixiv.net/member.php?id=1462361
• Pixiv novels: http://www.pixiv.net/novel/member.php?id=1462361