I was going to jump on the Tiger Claw bandwagon since he definitely was the most fleshed out of the new characters, but switched to Newtralizer in the end. Loved his design and name (I'm a horrible sucker for puns). His seemingly
Newtral alignment when he was first introduced (enemy of the Kraang, at any cost) was interesting, i.e. freed Slash but also wouldn't mind blowing up half of New York. It was cool how they tied his backstory to the Salamandrians in season 5, giving him a little more substance, though his electric powers were a bit much. Still overall my favorite newt kid on the block.