Red Soul Trait Is Not Determination by Crimson-Heartsss on DeviantArt
Music | Red Soul Community
Soul Type Chart(Redone) by MephistaTheDark on DeviantArt
SOUL Red - Rain International
Random thought I had (actually now that I think about it, Perseverance and Determination existing together as two separate things in this world at all is a little weird but oh well) :
Here's the red soul for the au I'm making : r/Undertale