Z: Z (whose full name is never revealed) is Tiller and Sairy's neighbor. He's described as a shady figure who helps Mr. Trepid find the understone funds in exchange for a large amount of money. He is not very responsible, but he easily learns helpful information. He helps the Ruby Holler family prepare for their trips, during which he learns that Dallas and Florida are his children when he sees Dallas's birth certificate and sees his ex-wife's name listed as his mother. He is very good friends with Tiller and Sairy and helpful to them.