From the show, "Rise of the Teenage Mutant Ninja Turtles", Donatello is a dry, snarky, and smart ass that loves praises for his own technical skills. Even in a christmas party, he likes to make a name for himself and talk about his own achievements. He can get embarrassed easily when either of his brothers do something stupid. Overall, Donatello is a genius but also a dork.

The official voice can be heard here for reference: https://www.youtube.com/watch?v=qnhhesNiZCs

(This Role Is A Minor Role)