so... the red soul isn't determination, why?

because all the humans could save, which means they all have determination.

my theory is that the red soul is all the traits combined!
why do i think this, you ask?

well, let's look at BALL GAME!
what does ball game say about the Red color?

yup... it's basically confirmed already.

Bravery. Justice. Integrity. Kindness. Perseverance. Patience. Using these, you were able to win at "Ball Game."

and it adds up even more considering that we turn into every soul color in the battles! (except orange and light blue, which are instead represented in attack form.)

i solved it... again.