If you haven’t already caught on, Tiny Tina’s origin story is tied to the Borderlands franchise. She made her first appearance in Borderlands 2, when she was called in to stop a Hyperion supply train that was believed to be carrying a Vault key the player needs.

The teenage character got her affinity for explosives after she and her family were sold by Flesh-Stick to Hyperion, becoming test subjects for experiments he was overseeing. This, unfortunately, caused her to lose her parents.

Source: https://www.distractify.com/p/is-tiny-tinas-wonderlands-standalone