Osoi

was a Kumogakure shinobi, he was the father of Musai and partner of Toroi.

Background
Osoi fought alongside Toroi in their last battle, both dying. He was later reincarnated by Orochimaru in an attempt to reincarnate Toroi.

Personality
Seemingly a very proud ninja, Osoi told his son that he should lie about his father's ability. He wanted Musai to ensure that the Raikage knew of his sacrifice.

Abilities
Osoi displayed no unique combat ability, but did reach the rank of chūnin and fought alongside one of Kumogakure's most famous ninja.

Trivia

 * literally means "slow" or "late".