Xenobiotic wasn’t a planned child. His mother, Heartsease, worked on a farm in a small town. His father, Space Invader, was later banished from the Enclave for his relationship with her and could not handle his life as a “dashite”. His father left when he was young, so from an early age he had to support his chronically ill mother.
Xenobiotic is a kind and friendly traveling merchant. After his caravan was attacked by raiders and he was the only survivor, Xeno decided to work alone. His strength lets him carry goods better than any brahmin, so he always has everything you need. He works a lot to help his sick mother, paying NCR taxes and getting her medicine.
Xeno’s worldview was built on pre-war ideals that he learnt from old books. He still believes in the magic of friendship and sees the good in everypony no matter their outward appearance.