The Blue Knight is mysterious and he saves Ichigo alot of times in battles. Ichigo wanted to know the Blue Knights identity and she first suspects that Ryou is the Blue Knight because he some how reminds Ichigo of the Blue Knight. Her second suspect was Keiichiro when the Blue Knight had a cut on his arm and Keiichiro had the same cut on his arm. Near the end of the anime/manga Ichigo finds out his secret idenity which was a surprise because the Blue Knight was none other then Masaya! But things started to go wrong for him as Deep Blue starts to take over his body. His first appearance was in chapter 16 (manga) and episode 18 (anime).
