First Appearance: LIAB Prologue 4 (Referenced)
Ken possesses a magic item, a mirror capable of showing the looker wearing one of his outfits.
Since the word "Ken" is also an old English word for Perception and understanding and from which we get the word "Knowledge", as well as meaning "Range of vision", View, or sight, it may be that Ken is an Eyemancer as well.
Real World References
May be a reference to Ken from the Barbie doll toy line.