Marker and Stapy

This article suggests the interactions between Marker and Stapy. The two appear to be good friends.

Interactions suggesting friendship
In Getting Teardrop To Talk, Marker and Stapy are sitting next to each other, Marker than asks Stapy if he'll play Toss The Dirt with him, Stapy accepts to play. Later on when Foldy picks Stapy to be on her team, Marker decides to go on their team.

In Lick Your Way to Freedom, Marker and Stapy kill Lollipop after she was freed from the jawbreaker.

In Today's Very Special Episode, Stapy, Foldy, and Marker plays Rock Paper Scissors.

Interactions suggesting conflict
In Today's Very Special Episode, Stapy found it "lame" when Marker said he didn't know how to play RPS, he was also very frightened when Marker played Four.

Trivia

 * Stapy appears to be Marker's best friend, but Foldy is Stapy's best friend.