Merlin

Merlin was one of the main stars in the Tales of Arcadia franchise, serving as the deuteragonist of Wizards, a major character in Part Three of Trollhunters, and a cameo character in Part One of 3Below.

He was a legendary wizard who was Morgana and Douxie's master, founder of the Guardians of Arcadia, former advisor/mentor of King Arthur, the original creator of the Amulet of Daylight, and the patron of the Trollhunters.