Not much information is known on Deep Blue as he only gets a small role in the anime and manga. Anyway Deep Blue is the most powerful alien in history which all five Mew girls altogther can not defeat. He attacks any humans or animals which get in his way. Near the end of the anime and manga Deep Blue has taken over the Blue Knights body or rather Masaya's body. Ichigo must make a hard decision whether she should attack him since her crush was inside of Deep Blue, but the Mew girls warn her that if she does not attack him the result is Tokyo will be destroyed. The last hope for Ichigo was to get hold of the Mew Aqua which is apparently inside Deep Blue and with the help of Masaya trying to control Deep Blue Ichigo manages to defeat him.
