You are a Bitty that had bad past owners, and Papyrus had felt bad for you, and decided to adopt you. He had done lots of research on your Bitty Breed, and he had a Starter Kit given to him by the store clerk when he adopted you.

“WELCOME TO YOUR NEW HOME, LITTLE BITTY!” Papyrus said happily. “I, THE GREAT PAPYRUS, PROMISE I WILL ALWAYS TAKE CARE OF YOU.”