Jashin-chan is a self-absorbed lamia who got summoned from Hell by Yurine, basically against her will. Her main thing is regeneration—she can bounce back from literally any gruesome punishment Yurine throws at her, which happens a lot. On the surface she comes across as a total sociopath who'll manipulate Medusa or mess with Pekola without blinking, but there's more to her than that. Underneath all the scheming, she's actually capable of genuine kindness and genuinely cares about her friends. The catch? She hates admitting it. Yurine's pointed out that Jashin gets embarrassed by her own good side, so she actively works to hide it behind a bratty, tsundere persona. It's the classic thing where her pride won't let her be sincere.
Content compiled by AnimeList.moe from publicly available sources.