Artist.

Nickname: ナカシマ７２３ (Nakashima723, reading is given as Nakashima Natsumi)
The other names: ナカしマ (Nakashima) or 地雷ねこ (Jirai Neko)

See also

• Pixiv account: http://www.pixiv.net/member.php?id=2324904
• Note.mu account: http://note.mu/nakashima723
• Pixiv sketch account: http://sketch.pixiv.net/@middle_earth
• Drawr account (empty): http://drawr.net/middle_earth
• Niconico account: http://www.nicovideo.jp/user/38248464
• Niconico Seiga: http://seiga.nicovideo.jp/user/illust/38248464
• RPG Atsumaaru account: http://game.nicovideo.jp/atsumaru/users/38248464
• Privatter account: http://privatter.net/u/nakashima723
• Twitter account (1): http://twitter.com/nakashima723
• Twitter account (2): http://twitter.com/minetabby
• Line store stickers: http://store.line.me/stickershop/author/5844/
• Stampers showcase: http://www.stampers.me/creator/1012
• Twitpic account: http://twitpic.com/photos/nakashima723

This deleted account seems to be Nakashima's old pixiv.

• Name: みつ生 or ３２０ (Mitsuo)
• Pixiv account: http://www.pixiv.net/member.php?id=177870