Blue Robin is one of Robin's split personalities made by the Mysterious Prism in the episode Some of Their Parts. He represents his craziness, having feral, animal-like behavior. He is voiced by Scott Menville.
Blue Robin was one of the personalities that emerged when Robin decided to use the Mysterious Prism on himself in order to create a better crime-fighting team. Beast Boy realizes Blue Robin is the crazy emoticlone of Robin. He fought Grey Silkie but was then defeated.
Blue Robin wears a blue shirt with the letter R on his chest, along with light blue gloves and sleeves, as well as light blue pants & black and white boots.
Blue Robin does not speak apart from strange maniac laughter and inhuman sounds.
Robin's blue emoticlone represents his crazy, maniac side. This is clear to see from his insane laughter and erratic movements. Blue Robin moves spontaneously and is very unpredictable.