Artist. Possibly another artist's second accounts.

Japanese name: 屋 (correct reading is unknown)
The other names: ユケ (Yuke), ユケオ (Yukeo), うこ (Uko),  "(●◎○)" or 信号機 (Shingouki)

h4.See also

* Twitter account: http://twitter.com/yukeosan
* Privatter account: http://privatter.net/u/yukeosan
* Old twitter (deleted): http://twitter.com/ukow0
* Old privatter: http://privatter.net/u/ukow0

(The artist had a Flipnote Hatena account, too.)
ya (yuke)