Artist, NicoNico video creator, best known for the artist's Touhou video series: Nise-Koumakyou
His fan-nickname, 友達が少ない人 (lit. "a person who doesn't have many friends") came from Rumia's quote in one of his videos: ”...Is that so? You have no other friends?”
Artist name: JACK
Fan-nicknames: 友達が少ない人 (Tomodachi ga Sukunai Hito) or メタルマックスの人 (Metal Max no Hito)
https://www.pixiv.net/users/1885391
https://www.pixiv.net/stacc/wkm74959
https://twitter.com/jack74959
https://twitter.com/intent/user?user_id=2848079953
https://seiga.nicovideo.jp/user/illust/6903747
http://dic.nicovideo.jp/id/4806658
http://dic.nicovideo.jp/id/4806669
http://www.nicovideo.jp/mylist/9634540
http://www.nicovideo.jp/mylist/15890161
http://www.nicovideo.jp/mylist/22235942
https://www.nicovideo.jp/user/6903747
https://sketch.pixiv.net/@wkm74959