Jason, also called Mondo Gecko is a classic character in the 2012 series of TMNT. He's a mutated gecko who is a good skateboarder (but not a good fighter) He has a typical surfer personality (IE saying dude, gnarly, cowabunga, etc) and gets really ticked off when people don't call him by his real name instead of his mutant name. From what FishFace has told him Mondo looks out for himself such as when Casey almost fell off a building and he laughed and didn't even bother to rescue him 