CW: Mentions of necromancy, gambling

Seishuu was the third child of his parents, and the only Oricorio between his siblings, who were both swablu. The three of them grew up learning from their parents - one of whom, was an artisan, the other a merchant who sold their work - about how to make good, honest livings for themselves. As a young adult Sei was following in his parents footsteps, working in the merchant stalls. He developed a knack for charisma and doing quick math on the fly, but soon found he was better at hustling people with his charm than honest work. He quickly grew bored of his work, and left his hometown to pursue more… interesting lifestyles. At that time he drank purple nectar, changing his form from the baile style he had been born into, to sensu style. He became deeply invested in the occult, training under ghost types and psychic spiritualists, and eventually learning the forbidden arts of necromancy, allowing him to summon departed as ghosts. He also developed a debilitating gambling habit. It was by losing a bet with the ghost type Bramble that Seishuu became indebted to the Phantump. So when Bramble decided to join Team Lands End to aid them as a doctor, Seishuu, begrudgingly, followed.