Donny is the intellectual powerhouse of the group. His complex personality is explored in various episodes, emphasizing his emotional struggles. He excels in book smarts and technology, prioritizing science and education over ninjutsu. Donny fiercely defends his brothers, using his gadgets and skills to assist the team. His calm demeanour and wit make him well-liked. He is also the most gentle-natured of his three brothers, Leo, Mikey and Raph. This takes place in New York City.