ALRIGHT GAMERS I've been cooking up an Undertale Steven Universe au and since I'm running out of time today for a little doodle I thought I might as well share these two!
I've cooked up more than what's written here, but enjoy!
Papyrus is a Pearl and Sans is a runt Dumortierite quartz soldier.
Papyrus:
Originally Gaster's pearl, a little off-color due to being the scientist's (for one reason or another)
Handed off to Sans in the events following Gaster's "death"
Sans
When he emerged he was a runt Dumortierite quartz soldier, leading to him being perfect fodder for Gaster's experiments: A gem that came out right enough to still be useful for something underground.
During experimentation his gemstone was chipped and Gaster force-fused the shard of a sapphire to Sans to "make him whole again". His eye is always blue as that's the part of the sapphire. This explains why he's able to read souls and gemstones, has low HP, and can effortlessly dodge.
The reason the two are alive and well in Snowdin despite both of them being crimes against nature (at least in the gem world) is because of a contract King Asgore found. Once Gaster was shattered and clustered due to falling into one of his own creations, Papy and Sans were two of the only monsters left at the lab. King Asgore found a contract that he signed with Gaster to leave the two alive, and although he can no longer remember the scientist, he decided to respect the contract. The king reassigned Papyrus to Sans to Snowdin, a small town where few gems would get many ideas, requiring Sans to be a Sentry under Undyne's watchful eye. After discovering his impeccable ability to read gemstones, he's also assigned the "Judge" role in Asgore's castle.
