YAHF: The Traveler

Xander dresses as a "Cooler Harry Potter" because he could only afford a fake wand.

"The Lone Traveler: Originally a Mortal Human Wizard and dimensional traveler, this being ascended to Godhood as a reward for services to the Creator. Very often arrives and leaves using a spectacular aura of blue light. His Divine name is Marek Ilumian, Fury of the Light, a Minor God of Knowledge and Travel and Patron God of Free Will. His appearance normally associated with preventing apocalypses or helping to ensure Free Will can be exercised by mortals. All assistance should be rendered when he appears. Does have a mischievous streak, especially when accompanied by a Goddess from another dimension who appears as a small innocent girl."Rupert Giles Watcher's Diaries, 27 September, 2000