Male artist, mangaka, cosplayer. Best known for his Izayoi Sakuya cosplay -> [1] (Dead Twitpic links: [1] [2] [3] [4] [5] [6] [7] [8])
If you catch sight of “Izayoi Sakuya with a surgical mask” artworks on pixiv, probably she is “ツキギ咲夜さん (Tsukigi Sakuya-san)”, his cosplay of Sakuya. In that case, use these tags: tsukigi_(cosplayer), izayoi_sakuya_(cosplay) and cosplay

Japanese name: ツキギ (Tsukigi)
Pen-name as a mangaka: 槻木 こうすけ (Tsukigi Kousuke)
Circle name: ツキギのとこ (Tsukigi no Toko)

See also

• Pixiv account: http://www.pixiv.net/member.php?id=932280
• Twitter account: http://twitter.com/tukigi246
• Twitpic account: http://twitpic.com/photos/tukigi246
• Pixiv encyclopedia article: ツキギ