Blue Knight Ozaki is a member of the KiraDeco 5 and also a charming member of the group. Sometimes called Aokishi, Blue Knight is very charming on his looks, which sometimes makes Garnet fall in love with him. He was once from Kobe, being a famous idol singer with many admirers until his fame faded. Thought to his fame, he felt emptiness in his life without real friends until he met the KiraDeco 5 in their mission to protect justice. Along with the others, he is summoned to Jewel Land due to unknown reasons. In his stay in Jewel Land, he became Garnet's personal "sheep", also serving as the head butler. However in the last episodes, he was fired by her and told to use his skills to protect every women in the entire world, allowing his Jewel of Fate: Blue Garnet to materialize. He used it to transform into his new form. By the end of the series, he received an earring speaker as a present from Garnet before going back to the Human World so he can hear the girls seeking help.
He goes in the codename Blue Knight Blue and has good fighting skills using his legs.