Waylon is the father of Russell. He appeared on one Halloween night after Phineas and Ferb find that his haunted house wasn't really haunted, because it was all tricks and it wasn't a real house ("That's the Spirit").
Waylon has brown hair. He said that he always wears the same shoes.
Skills and Traits
Waylon and his wife own a haunted house, and knows how to make it very scary. He is proficient at special effects, which he uses for his haunted house. It is possible he could have majored in special effects.
It's possible that he does not live in Danville at all, perhaps instead traveling during the Halloween season.