Key-per

Key-per (less frequently, Gatekey-per) makes his first appearance in Adventure Time in the episode "The Enchiridion!." His key-shaped hat is, in fact, the key to opening the gate to Mount Cragdor. Finn was able to get through the gate by sticking the key-per into the lock! The Key-per then asks how Finn figured it out. Finn states that,  I thought you would look cute in there. Surprisingly, that's how most people get through the gate the key-per then states. Key-per is a very talkative person, and his speeches are usually incomprehensible because he speaks so fast. He is the gate keeper to the pathway of The Enchiridion. When he is ready to sleep, he wears devil pajamas. After defeating the Dark Magician, Finn, in his rage, sees Key-per in his pajamas, mistakes him for another trial, and punches him in the stomach. The Key-per then explains that they're pajamas. He can also make spaghetti.

Appearance
He is described as tubby. He has yellow skin, and wears a baby-blue shirt that is probably too big for him. Key-per also wears a key-shaped necklace and a hat with the shape of a F backward (resembling a key).

Quotes
"Greetings, young heroes-to-be! This mountain is called Cragdor. It's purpose is two-fold: to protect the Enchiridion and to test the hearts of those who seek to possess it!"

"Many noble challengers have entered and attempted to pass the wholing trials that lie behind these walls, but no one has ever left here alive or dead!"

"Oof! These are my pajamas! I was getting ready for bed."

Trivia

 * His name is a pun and a portmanteau of the words key and keeper.
 * Key-per is voiced by John Moschitta Jr., who holds the world record for the world's fastest talker. Moschitta is also known for voicing Blurr from another Cartoon Network Studios series, Transformers Animated.
 * In the game, Righteous Quest, Key-per shows up twice: once in a red robe and once in his original blue robe.
 * The Key-per bears a strong resemblance to the Door Lord. But on the contrary, they are the exact opposite. The Key-per is small, and wears robes and a key hat. The Door Lord is tall, and wears nothing and a door hat.
 * He wears devil-like pajamas.