In "The Evillustrator", when Chloé mocked his art and his crush on Marinette, he was infected with an Akuma by Hawk Moth and became the Evillustrator, an artistic supervillain whose drawings became real.

His real  name is Nathaniel K, also called Nathan, Nate and Nath, is a major character of Miraculous: Tales of Ladybug & Cat Noir. He is a student at the Collège Françoise Dupont and a former student of Miss Bustier's class, before she became mayor of Paris.