An Zengaiina

An Zengaiina is a prisoner on Level 2 of Impel Down.

Past
At some point in his life, Zengaiina was sentenced as a criminal and imprisoned on Level 2 of Impel Down.

Impel Down Arc
He and other prisoners were freed from their shackles and cells by Buggy and Luffy. However, after hearing the roar of the sphinx, he chose to stay in his cell out of fear.

Trivia

 * His name is a pun on anzen ga ii na (安全がいいな), referring to his fear of leaving his cell.