Core Frisk

She typically appears as a young woman with neatly cropped short hair, pale gray skin, and a pair of Abyssal-like eye sockets that she can never quite close. She wears a fuzzy long-sleeved sweater with a pair of horizontal stripes, athletic shorts, white socks, and semi-formal shoes.

A fickle, enigmatic individual who, despite possessing seemingly limitless knowledge and wisdom, thinks like a child. She often displays a mixture of immature childish behavior and wise adult demeanor, using eloquent words and sassy remarks within the same conversation. While she's perfectly capable of acting mature, and most people's first impressions of her are likely reserved, most quickly notice Kor's childish side. It seems that while Frisk wants everyone to take her seriously, she also doesn't want people to avoid her out of fear. Therefore, she goes out of her way to appear as harmless as possible. Despite this, Frisk claims to never pretend and simply behaves as she pleases.
Despite being incredibly compassionate and always ready to help, deep down she believes that no one understands her better than herself, and she can subtly treat everyone the same way. The more she dislikes someone, the more this behavior manifests itself, even to the point of mocking condescension, though most people will never see this side of her. More than anything, Frisk rejects the idea of ​​sacrificing people's lives and well-being for things like the "greater good" or "creative vision," and she cannot tolerate having her ideals questioned. Therefore, Core Frisk despises those who intentionally hurt others for the sake of curiosity, advancement, or power. It's worth noting that if these people are simply delusional or desperate, Frisk WILL use all their strength to help them improve and set them on the path to redemption. Ultimately, Frisk has a simple goal: to help others.
Frisk's fear of sirens and guns appears to stem from the trauma she suffered during the war that marred her childhood. She also dislikes being underwater because water leaks out of her eye sockets, making it very awkward to pour back out.