Papyrus/Relationships

=== Shae ===
Shae is Papyrus's younger adoptive sister. Shae and Papyrus quickly grow close and have a positive relationship; Papyrus quickly adopts her as his sister, and Shae quickly does the same. The two often meme together and stick up for each other, bicker, and are protective of each other. They share their love for fire.
=== Sans ===
Sans is Papyrus's older brother. He and Sans are very close and have a positive relationship. Sans raised Papyrus from when he was very young, and Papyrus is a driving motivation for him. The two often meme together, bicker, and keep each other in check as each other's FOIL. Sans is shown to be somewhat protective, bordering over-protective of Papyrus, often sticking up for him if someone bad-mouthed him or tries to bully/hurt him. The two also often hang out and they genuinely enjoy each other's company.
=== Gaster and Ariel ===
Papyrus loves his parents very much. He often memes on Gaster and trains with Ariel. He likes to pull pranks on Gaster, and sometimes Ariel.
=== Mettaton ===
The two have not interacted much. However, Papyrus is a huge fan/admirer of MTT, and has a lot of his merchandise and loves seeing his shows. Mettaton doesn't seem to have any issues with him, and once gave him a makeover with Shae and attended one of his parties. He also told Shae he'd be upset if she were to do something hilariously stupid, but he implies he sometimes forget his name, though he knows it.
RG Stooges
Papyrus has been friends with the RG stooges since he was young. He met them through Sans as his friends; on one of his birthday parties, a heartbroken Papyrus had nobody show up. A sympathetic Sans invites the Stooges over to the party. The trio show up with presents and party with him, befriending him. Ever since, they've showed up to Papyrus's birthday party every year.