quartz von beelzebub

Katakana: クォーツ・フォン・ベルゼーブル
Romaji: kwōtsu fon beruzēburu ("Beelzebub" taken from FFWiki)
Original character from Nanaroku (Fortress76)'s Touhou fancomic Gensoukyou Great Sports Day ～ 200 yojana in a flash ～
First appearance at post #705944