Brook

Bisuke

ビスケ
Bisuke (ビスケ; English TV "Biscuit") is a ninken and a summoning of Kakashi Hatake. He bears an uncanny resemblance to Gaara with a kanji imprinted on his head and dark rings around his eyes. However, where Gaara has the kanji for "love" (愛, ai), Bisuke has the kanji for "shinobi" (忍). (Naruto wiki)