Comment by Chrome on Savior of Divine Blood ~Draw Out 0.00000001% To Become the Strongest~ - Chapter 15

@Chrome it also reads your soul and see if your considered "worthy" of the power that's why those who get golden doors are all in the side of good(obviously his brother was trash cuz he stole it from Subaru) and the story and plot is good and the mc shows many traits like hubblness, kindness, hatred, and a very good sense of fairness and justice those traits probably also fit vanquish and that's why Subaru deserved his power cuz he earned it

@FIX FOX I think rainbow/vanquish's door is neutral.
( sort of like the collector from owl house or Alastor from Hazbin hotel ).

@Chrome ye possibly he does have a neutral alignment along with mc too

@FIX FOX Black is evilness, rainbow is anger, gold  is morality, silver is pride,  and copper is determination

@The Jester G** is this info confirmed?

@Chrome Nope, just my guess, but rainbow could be neutrality since it has all the colors it has all the qualities