Walt

Walt is Zach,s older brother and is seen around his brother in a few episodes. In Season 3, the episdoe called The Missing Map he gets jealous of his brother since he,s a Fith Turtle and steals a pouch with some information about the Turtles Lair and the Foot Clan. Shredder wants to steal it but in the end he and his brother save the day and he,s another good ally to the Turtles