Leafcil

 is the femslash ship between Leafy and Pencil from the Battle for Dream Island fandom.

Bowling, Now With Explosions!
In the puppets section, Leafy walks up to Pencil and asks how it's going, and Pencil says she's just looking at clouds. Leafy says that she seems bored and they should do something fun like jumping off a cliff.

Pencil is about to jump, but Leafy says she didn't mean it literally. Pencil jumps and asks "Oh so you didn't mean it literally?", showing that she thought Leafy HAD meant it literally. Leafy said she hadn't. Pencil said "So we're not cliff jumping", and Leafy said no. Pencil suggests they watch clouds with Pen. Leafy agrees.

Leafy saw Pen and Pencil with real-life versions of themselves, and said she wanted one too.

The Reveal
Pencil thinks that Leafy's gift for Bubble was a trap. When she was proven wrong, Pencil was mad that Leafy had gotten a gift for Bubble but not her. Leafy felt bad and took the shoes she gave to Bubble and gave them to Pencil instead. This made Pencil happy.

Pencil said that they shouldn't commemorate Blocky's elimination. Leafy agrees with her.

Rescission
Leafy gets mad at Pencil for killing Firey. Pencil kills Leafy right after.

Return of the Hang Glider
Originally, Pencil was going to vote for Bubble instead of Leafy to win Dream Island, however this changed when almost all of Leafy's voters were going to slap her, so she changed her vote to Leafy.

Pencil got mad at Firey when she learned that he didn't let Leafy onto Dream Island.

However, later Pencil decides that Leafy deserves the death penalty for stealing Dream Island. She also was the one to find Flower's announcer crusher to kill Leafy.

Get Digging
Pencil warns her team to run away if they find Leafy.

Enter the EXIT
Leafy warns Pencil about what happens if she doesn't do her work. Pencil doesn't seem to care about the consequences though, saying she built up a tolerance for 4's screech.

It's also shown that Leafy knows Pencil well when Leafy says that Pencil liked excluding people who aren't part of her clique.

Get to the Top in 500 Steps
Pencil looks jealous when Leafy rejoins BFB.

Fanon
is neither popular nor a rarepair in the Battle for Dream Island fandom. It's popularity is somewhere in between, but it's closer to being a rarepair. This is likely due to their little interactions. Or because it's foreshadowed by it's rivalry ships, Matchcil (Match x Pencil) and Leafpin (Leafy x Pin).