Artist.
Japanese name: ゆうま (Yuuma)
Old name: 橋爪 佑馬 (Hashizume Yuuma)
Site names: らくがき倉庫 and 駄菓子屋
https://www.pixiv.net/users/30197
https://www.pixiv.net/stacc/0pumpkin
https://twitter.com/108mash
https://twitter.com/intent/user?user_id=17308584
https://seiga.nicovideo.jp/user/illust/1325073
https://www.nicovideo.jp/user/1325073
https://sketch.pixiv.net/@0pumpkin
http://www.geocities.jp/bb1gou/
http://www.geocities.jp/bb1gou/00000index.html
http://p.twipple.jp/user/108mash
http://twitpic.com/photos/108mash