donatello ninja turtle
Donnie is particularly skilled, having “a way with machines” and is the most intellectually inclined of the siblings. Of all of the turtles, he has devoted more of his time to non-combat oriented pursuits, such as the study of technology, biology, chemistry, mathmatics, and metallurgy. This makes him very nerdy, especially in the eyes of Raph. Donnie is the 2nd most mature out of all his brothers, aside from Leo, and often is the voice of reason and logic. In previous incarnations, Donnie is seen as second-in-command, but no such title has been established in this series, thus far.
Donnie is not without faults. He is nervous, tense under pressure, easily annoyed and, while not prone to regular bursts of anger like Raph, he can lose his temper, especially when technology fails or performs ineffectively. He is also rather romantic and very loving. He is able to appreciate the love between his father Splinter and his late wife, Tang Shen.
In the current comics, Donatello finds an armored truck in the sewers which apparently had been part of a bank robbery in the sixties. Along with Raphael and Casey Jones, he undertakes the task of fixing up the vehicle. After the death of Splinter, Donatello secretly goes to his body and asks forgiveness before clipping something off him. Shortly after, Donatello decides to accompany the Utroms on a mission to Tepui to search for two missing research teams. The group are attacked by strange wooden creatures who shrink them to miniature size. The creatures turn out to be a group of Utroms which had been stranded in the Jungle during their first stay on Earth and had been living in secret thanks to their Quantum Inversion Redimensioning device which could alter their size. The process could not be reversed on Donatello, possibly due to his mutation, leaving him the size of an action figure. While the Utroms work on returning him to normal, Donatello put his new size to use infiltrating a terrorist organizations warehouse. He’s also made a robotic body for him made to resemble a turtle to help him move around.
He is usually depicted wearing a purple eye mask. His primary signature weapon are his (2) effective bō staffs. In all media, he is the smartest of the four turtles. He is listed as 4′ in height on the original action figure release  . Donnie often speaks in technobabble with a natural aptitude for science and technology. He is the middle of the turtles, and third-in-command. Like all of the brothers, he is named after a Renaissance artist; in this case, he is named after Italian sculptor Donatello. 
Jill Kaufman/New England Public Radio
“I have two greens that I’m considering,” Talbot says as he follows a stencil outline on his client’s arm. “But I’m not going to just have a flat color. “I’m working colors together like I do with my traditional art.”
Had Raphael not gone off on his own, he never would have met April O’Neil who became a great ally and friend for the turtles. He also confronted Casey Jones, a similarly hot-headed individual, in a fight that Raphael lost, but his intense style of fighting so impressed Jones that the two became close friends and allies against the Shredder.
Pete Ploszek, who only has two credits to his name with bit parts on Showtime’s Shameless and NBC’s Parks and Recreation, has been hired to play Leonardo, the blue masked katana expert of the group. He is the oldest turtle, and considered the leader.
Jeremy Howard has signed on as Donatello, the scientist and smartest of the turtles, a role originated by Corey Feldman. Don wears a purple mask and is a master of the bo staff. He is the least violent of the turtles and likes to use his brain rather than his fists in a conflict. Jeremy Howard played Sketchy on Breaking Bad and has a lot of one-off TV credits to his name.