Green lantern

Green lantern, AKA Hal Jordan, is a mortal who accidentally found a broken low-level magic ring, which leaks so much magic that it needs to have it's mana refilled by a magic lantern. Strangely, he doesn't seem to realize how weak it is, and hallucinated that he is a member of an interplanetary race of aliens called the "Green Lantern Corpses", of which there are 3,600 others like him. Even more strangely, the lantern and ring are blue, so we are forced to believe that he is partially or completely color blind. He believes that he regularly fights demons from a parallel universe called qward. Qward exists, of course, but there is no life there.