Episodes suggesting a friendship
In "Take the Plunge: Part 2", Pencil seems to be in agreement with Match and Pin for having Pen join their team.
In "Cycle of Life", Pen carries Pencil during the challenge and Pencil looks really happy about it.
In "Yeah, Who? I Wanna Know", Pencil tells Pen to use the Leafy detector to find Leafy, after Pen just guesses which way Leafy went. Pencil also called him "Pen Pen", which is almost similar to her nickname, "Pence Pence".
In "Insectophobe's Nightmare", during the contest, Pencil didn't care that Pen was being dragged for the entire contest.
In "Return of the Hang Glider", when Pencil wants Bubble to win, Pen is one of the few contestants with arms who don't slap her. Later, Pencil randomly appears behind Tennis Ball, telling Pen to get over the fact that Dream Island has been stolen.
Episodes suggesting a conflict
In "Puzzling Mysteries", at the end of the episode, when Pen finds two pieces that fit together, Pencil scolds him by saying "Finally!"
- They're both used as stationery supplies.
- In "Rescission", two people submitted recommended characters for the next episode: PencilDitz (who recommended "Pencil & Pen's Baby") and MurielEpic (who recommended "PencilxPen", a combination of the two). "PencilxPen" was rejected in favor of the other character "DNA".
- These two characters' names both start with "pen".