Isaac Newton (voiced by Jackson Doherty) was an English mathematician, physicist, astronomer, theologian, and author who is widely recognised as one of the most influential scientists of all time, and a key figure in the scientific revolution.
As they say he is born in 1643 and visited 1658 that makes him approximately 15 years old when encountering the Riddles.
Yadina points out a painting of him at the start of Secret Movie.
Isaac, as a child, is depicted with fair skin and long, wavy brown hair. He wears a blue and yellow jacket over a white shirt, brown pants, white tights, and black shoes with yellow buckles. He also wears a white cravat.