Ambrose

Ambrose is a student that doesn't bother talking to people and prefers to stay in his own fantasy world. In his last year of high school he becomes friends with the witch, named Cassian, developing some kind of romantic feelings for him. Ambrose is cursed by him for accident. Their skin becomes extremely sensitive to the sun but also regenerates extremely fast, making him "immortal". When Cassian tries to travel to another dimension, Ambrose messes up the formula by accident, making him, Cassian and Cassian's mom travel to a different dimension and erasing his original one. In this new place they don't exist, so they live under a magic spell that makes them look like they've always lived/existed there, in another version of their town.