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






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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