Ferbgor

Ferbgor, Ferb's Victorian ancestor, assisted Dr. Phineastein in creating a Platypus monster and a Two-headed cow, and most likely any other creature that Dr. Phineastein has made. He is shown wearing a brown monk hood. He only appears in a flashback, with Dr. Phineastein, Constance, who was probably their guardian, Dr. Doofenshmirtz's ancestor, and an ancestor of Isabella. Just like his descendant, Ferbgor is a man of few words (though he never speaks in the flashback) ("The Monster of Phineas-n-Ferbenstein").

Background Information

 * He is Ferb's only known ancestor from very long ago, as he is Ferb's great, great, great, great, great, great, great, great, great, grand uncle.
 * Ferbgor lived in Druelselstein with Dr. Phineastein.
 * Ferbgor is very similar physically to Ferb, but with a hunchback and bags under his eyes.
 * His name is an obvious parody of Igor, the common name for those with a hunchback.

Appearences

 * "The Monster of Phineas-n-Ferbenstein"
 * "That's the Spirit" (cameo in the tittle credits)