its weird there is so much variants/debate on this considering we had like the worst possible option for 10 years lol. Anyway all of these are improvements so what ever you pick its fine.

@xxXEddieXxx Neutrality is not a "nothing's happening" relationship. That is the Neutral player (always at war with everyone) or a player assigned to Does Nothing AI.

Neutrality can be used to depict a situation like two unfriendly countries fighting against a common enemy. For example, if you would want to depict America, Britain and Russia fighting against Germany (assuming there are only these 4 players for simplicity) but with the rule that America/Britain and Russia cannot send units in each other's land territories (which is almost historically correct), you would set Allied for America and Britain, Neutrality for America and Russia and for Britain and Russia and War for everyone else.

In this case, Neutrality is practically "Almost Allied" or Allied with restrictions. (For example, their fleets will be able to defend together just like if Allied.)

@xxXEddieXxx said:

@Cernel

Neutral is basically the "nothing's happening here" state

I'll do some nit-picking (because here it is clear you are talking about Neutrality as a state, not about Neutral as a player), but let's not confuse Neutral and Neutrality. Neutral in TripleA usually refers to the Neutral player, which is always at War with everyone. Neutral has nothing to do with Neutrality. (Yes, the archetype of Neutrality is "neutral", so "neutral" can be either the archetype of the Neutrality relationship here as well as the Neutral player which is always at War with everyone.)

@Ondis said:
Gray is better, but white text doesnt work for it unless very dark and the dark default color for TripleA is already dark gray.

I think that middle-way grey (meaning exactly in the middle between white and black) works with either black and white text. Example:

Neutral is basically the "nothing's happening here" state

Then I would imagine you would suggest using exactly the same colour as the TripleA default colour for impassables, which is functionally the closest to neutrality.
This is that colour (according to 2.3.22161 https://triplea-game.org/release_notes/) but darkened in the middle of the values of Red and Green: