Which turtle would be the most dangerous if they suddenly turn evil

I was reading this fan comic where it was the episode of karai being controlled by a worm in it karai decided to put a worm in Donnie head where he help karai and almost tortured his brothers master comes to rescue them and manages to get rid of the worm that was on karai but Donnie was givin a special worm where this one was going to kill him by slowly destroying his brain while he continues to try to attack his friends and family I think it still continuing the person who made it is called cupcakeslushie and the comic is on tumbler so this made me think who would be the most troubled to deal with if the turtles turned evil