Ricardio

Ricardio makes his appearance in Ricardio the Heart Guy. Finn seems to show a rivalry with him due to the fact that Princess Bubblegum seems somewhat attracted to him, as Finn has a crush on her. This is exampled in the advertisement for the cartoon when Finn says,"I can't compete with that, he's talking about science dude!",to Jake when he saw the two spending time together. This obviously made him jealous. Finn punches Ricardio in the face in one episode; it is unknown if this is the same episode,

Quotes
"You must excuse me."

"Relax youself now, Lumpy Space Princess!"