The Boy in the Mirror (2014) on Netflix

Plot summary

Fernando is a boy who lives his fantasies intensely and keeps looking for more free time. He flies like a bird, plays at jungle adventures, builds planes, and stands up to the bullies at his school. Mariana, his friend, and Capeto, his dog, are part of the secret society he leads, and the mysteries he solves with them include a haunted house. More than anything he wants a double who would take on the annoying parts of his days. Odnanref, his reflection, steps out of the mirror and becomes real, obeying his wishes and assuming his identity whenever Fernando asks.