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My undertale soul colour headcanons

-Monsters have soul traits as well, but they are too desaturated to be visible. Determination is not a soul trait but a substance that saturates the colour of the soul. Humans, who have a lot of DT, have very bright soul colours.

-A human's eye colour matches their soul's. Since Chara/Frisk (Depending on who you think was to blame for the red eye colours in the soulless pacifist run), have red eyes, and eyes are the window to the soul after all.

-Hot take: If Sans had a soul trait, it would be Justice, not Patience

Most fanworks associate Sans with patience, but if you think about it not much about him relates to the trait. We give him that because he's blue, lazy, and doesn't do anything. But that's not really patience, just laziness, and probably depression.

Sans is much more intertwined with the concept of Justice. He judges the player for every EXP they've earned. His very magic delivers karmic retribution. He fights you only on the route where you kill everyone. The yellow eye is usually skimped in favour of the cooler (ha) looking blue eye, but I personally think it has a lot more lore importance.