This Morty was a lot more strict and forceful than most other Mortys. He had no problem killing his grandfather, having already deemed him an inferior version of Rick.

He also refused to take orders from a Rick and pointed a gun at him when he tried to say what they should do. But Morty still maintained a slight innocent wonder, missing his old adventures with his grandfather and still enjoying the use of Mr. Meeseeks. He also carries a Luger everywhere and orders everyone around.