Kyuubey
His name is written in both Hiragana and Katakana as キュ(kyu)ゥ(u)べ(be)え(e). So the more acceptable Romaji for his name is Kyuubee/Kyuubey.
He is a familiar who can grant any wish to a certain girl, on the condition that she becomes a Puella Magi and fights against witches.
Pictures
+2
Mangaography
Mahou Shoujo Madoka★Magica
Magica Quartet, Hanokage
Mahou Shoujo Madoka★Magica: Majuu-hen
Magica Quartet, Hanokage
Puella Magi Homura Tamura ~Parallel Worlds Do Not Remain Parallel Forever~
Magica Quartet, Afro
Mahou Shoujo Madoka★Magica: The Different Story
Magica Quartet, Hanokage
Mahou Shoujo Suzune★Magica
GAN, Magica Quartet
Mahou Shoujo Oriko★Magica
Magica Quartet, Kuroe Mura