Finnceline

Finnceline is the het ship between Finn and Marceline from the Adventure Time fandom.

Canon
In the episode "Evicted!", Marceline was messing with Finn by making herself look evil. After she got punched by Finn, she said "That actually hurt, Finn", then shapeshifted back to normal form, and kissed Finn on his cheek.

In the episode "Go with Me", Finn was trying to hang out with Princess Bubblegum. Marceline gave Finn some bad ideas and caused Bubblegum to banish Finn. When they were at the treehouse, Marceline said sorry to Finn, kissed him on his cheek, and then flew away. After that, Finn decided to ask Marceline to the movie, however, Marceline thought he was trying to date her, and said she didn't like Finn romantically. After Finn explained that he just wanted to watch movie with her, she accepted.

Finnceline was once drawn in Rebecca Sugar's concept art, who came up with the idea of Bubbline.

Fanon
Finnceline was popular along with Fubblegum in the early seasons of the series. However its popularity got surpassed by Bubbline after "What was Missing".