Donatello's head is a new mould made for the turtles. It is dark green with a purple bandana around it. In 79105 he has a smile expression in which his diastema (gapped teeth) is clearly visible, but in 79101 he is frowning. He wears a new turtle shell piece made exclusively for the Teenage Mutant Ninja Turtles line. It is khaki, has a turtle shell pattern and has two brown straps over the piece. The front of Donatello's torso piece is green with turtle scales and a continuation of the strap peices from the shell piece. The back of the torso features turtle scales and a brown strap at the bottom. His legs are green, just like the rest of his body, and finish off the scale printing, also, there are brown knee pads on his knees.
Donatello (also known as Don or Donnie) is the brains of the turtle team. He is a natural inventor and electrician, knowing almost everything there is to know about technology. He would rather talk things out than fight and uses violence as a last resort. Though he is often portrayed as being more focused on his studies than ninjutsu training, Donatello has shown himself to be a very capable fighter, in particular, when he is in a life-or-death situation. He can set up plans as quickly as Leonardo, if necessary, though they usually center around one of his inventions or something else that would bar Leonardo from knowing the ins and outs of the plan in question. It is presumably for this reason that Donatello is often viewed as the level-headed second to Leonardo's command. In the new TV show on Nickelodeon, his love interest is April O'Neil.
- In the show he is voiced by Rob Paulsen who voices The Riddler in LEGO Batman 2: DC Super Heroes.
- He and Leonardo have different shells than Michelangelo and Raphael.