Mr. Feeny
In the Golden Cheesecake Pirate Armada Universe, there are two men going by the name of Mr. Feeny.
Mr. Feeny (Boy Meets World)
The character who was played by William Daniels in the 90's sitcom/drama, Boy Meets World. Believed to be made of gold. As in Boy Meets World, Mr. Feeny operates as a mentor to the pirates while living right next door to them. It should be noted that his house is located in a special pocket dimension which is adjacent to every other house in existence, making him everyone's neighbor.
He once was a collegue of Bob Saget before he turned evil (as well as a crewmate on Shamus McScruffy's Blood-Red Eclair), and they started a Pirate Academy together. Mr. Feeny made his first GCPA appearance when the pirates went to him for romantic advice in The Golden Cheesecake Pirate Armada Valentine's Day Special: Mind of the Tapdancer, Heart of Granola. Feeny told them about his experiences with the characters of Boy Meets World and how he was always there for them- as their teacher in grammar school, high school and college, as their boss in all their jobs and as the owner of their retirement home.
Feeny also appeared in The Semi-Last Stand, where he was apparently killed by Dark Siren, whose dark side Feeny had repressed years ago. However, Feeny was revived in a body that was completely identical to his old one through mental powers.
In the GCPA Finale, he graduated the pirates and ascended to a higher plane with Mr. T, his time over.
Quotes
"I did it for you own good, Miss Siren, just like the detonator I planted in Topanga’s body to make her marry Cory."
-The Semi-Last Stand
Mr. Feeny (Teacher)
The other Mr. Feeny is a young teacher at the pirates' high school. He shows up from time to time, usually differentiated by Peter Feeny. There's also a completely unrelated Ms. Feeney whom I don't think we've referenced yet.