Artist.

Pixiv nickname: わたぬき (Watanuki)
Suimy nickname: "( ◠‿◠ )"
Old name: まど (Mado)

See also

• Pixiv account: http://www.pixiv.net/member.php?id=1549592
• Suimy account: http://suimy.net/user/suimmy/content