Flasket Brinner was an inventor who created Clockwork Panda.
After a long life of inventing, Brinner retired from work. He ran away from his shop in the middle of the night shouting, "I'm off to see the multiverse". Brinner travelled through many universes before eventually reaching the home of Wendy, a giant girl with the power to manipulate reality. Brinner tried to dissect one of Wendy's unicorns to see how it worked; this angered Wendy and she pushed Brinner into the side of a house which collapsed on Brinner, killing him. Wendy could resurrect Brinner if she wanted to, but she couldn't heal the parts of him that had been squished.
When Clockwork Panda's heart broke, Iris Wildthyme sought out Brinner to get a replacement heart. She visited his shop and learned of his retirement. Iris then followed the trail Brinner left across the multiverse and reached Wendy's universe. After learning of Brinner's fate, Iris got Wendy to fix Panda. (PROSE: Flasket Brinner and the Clockwork Heart)