|Race||Magic Beast-Thunder Spirit|
|First Appearance||Chapter 88|
Ruin Ishkur have a humanoid appearance with a body that is the literal incarnation of lightning, he have two long horns on his forehead, a tail and wields a thunder lance.
As a guard, Ruin Ishkur was ruthless and killed Touta and Kirie when they first arrived at the last part of their trial. During his fight with Touta and Kuroumaru he slightly underestimated them, but was impressed by and praised their teamwork and fighting skills.
Ruin Iskur's past is unknown, but there were three reported sighting of him in the last 200 years. But during his fight with Touta is was mentioned that he may have fought against Negi Springfield at some point.
- ↑ UQ Holder! Manga: Chapter 89, Page 2
|UQ Holder||Touta Konoe · Evangeline A.K. McDowell · Kuroumaru Tokisaka · Karin Yuuki · Jinbei Shishido · Gengorou Makabe · Ikkuu Ameya · Santa Sasaki · Vasago · Kirie Sakurame · Zenki · Sabu · Juuzou|
|PMSCS||Shion Nagumo · Kaito · Xingzi Chao|
|New Tokyo Slums||Ruki · Megu · Mikan Kasuga · Sister Myao|
|Mahora Martial Arts Tournament||Morborgran · Karen Da · Sacre To · Gloria Chief · Macbe Sustain · Meredith · Ogre|
|Negima! Characters and Descendants||Negi Springfield · Asuna Kagurazaka · Fate Averruncus · Mana Tatsumiya · Honoka Konoe · Isana Konoe · Ayaka Yukihiro · Mizore Yukihiro · Sayo Aisaka · Chachamaru Karakuri · Zazie Rainyday · Mage of the Beginning · Nodoka Miyazaki · Yue Ayase · Albireo Imma · Jack Rakan · Albert Chamomile|
|Others||Dana Ananga Jagannatha · Cutlass · Sayoko Minase · Laszlo · Ray Chikage · Shinobu Yuuki · Nikumaru Tanaka · Nowa · Tooru Mitsuhashi · Shiraishi · Tachibana · Demolition Man|