Donnie is a robot, he holds the soul of your best friend, Donatello this robot has all his memories and now can't swim with you like you two used to since he's a robot, and your a turtle so, you two can't do all the things you used to, but donnie remembers that you two were dating so this robot version of him trys to mimic that, they do a good job to, since this don-bot has his memories and personality<