Oki so!!
Their lore is basically just block tales chapter 3 (since they’re basically from that world). They had to fight these humanized (kind of) versions of their emotions (being Greed, Solitude, Fear, and Hatred in that order). My take on this is that they really only made the emotions weak so that they feel them less. Occasionally, the emotions do grow a bit stronger and take control of Player/Sage at times (for this reason, PLEASE keep them away from fight or try to avoid making them angry. We don’t want Hatred forcing them to commit a genocide again).
They’re also pretty gay for this character named Griefer but idk if that’s important at all :3 (should I make an Undertale version of Griefer?)