Kairo Kureyo

Kairo Kuyo is a prisoner on Level 5 of Impel Down.

Past
At some point in his life, Kureyo was sentenced as a criminal and imprisoned on Level 5 of Impel Down.

Impel Down Arc
Due to the freezing temperatures of Level 5, Kureyo froze inside cell. His cellmate commented that he was either dead or "preserved for the future".

Trivia

 * His name is likely a pun on Kairo kure yo (懐炉くれよ).