Willem Kmetsch/History

Willem hails from an orphanage in the small town of Gomag which had a population count of about 3000. It is shown that he likes kids, although some people mistake it for "him being into small girls".

Willem dreamed of becoming a brave at a young age. Under the tutor of his mysterious master - former 18th regal brave and owner of the orphanage Nils D. Foreigner - he becomes a Quasi Brave. He desires to protect the people he loves. Due to this he continued training in various arts and skills, but he could never learn higher level abilities due to his lack of natural talent. Willem describes it as "a wall he can never cross".

Willem suffered significant damage to his body due to the curses that were caused by the severe backlash of 7 forbidden spells he used when fighting the Poteau Ebon Candle, one of the three protectors of the Visitors, an immortal earth god. The combined effect of the backlash destroyed his body and petrified him. It is said by multiple doctors and Naigrat/Nygglatho herself that it's a miracle he's even alive. It is later revealed in the LN that it's extremely difficult for Willem to even walk due to his frail bones and muscles.

Technically speaking he won the fight around 500 years ago due to Willem completely obliterating the Poteau's body, causing the god to die on the spot. It's worth mentioning however that Poteaus, being the immortal gods that they are, do not die permanently. Ebon Candle is seen to return in episode 6 of the anime as a giant black skull (He still hasn't completely recovered from the fight before) on a wheelchair as a guardian of Regal Aire. Grick's salvaging group found him 525 years after humanity went extinct (526 years after he was petrified), and brought him up to the land in the sky.

When the anime started, he had already been living on the floating islands for a year.