First Appearance: First Intermission 43
Unknown MK Caster: Jeftichew may be the unknown caster hiding behind the Goblin Knob portal when Parson Gotti enters the Magic Kingdom (Book 2, Page 60). This speculation is based on the unknown caster's eye color, which is identical to Sylvia's, a former Unaroyal unit; and on his similarity in dress and facial hair to Fedor Jeftichew, a real world historical figure (see below).
Real World References
Fedor Jeftichew was a 19th century circus sideshow, the "Dog-faced Boy," who moved to the USA to tour with P.T. Barnum at 16.