Overlord: The Undead King Oh! - Vol. 2 Ch. 11.1 - The Pleiades' Member Colors

[MangaDex]

 

[nomadicengi]

Welp, the subreddit is going to be colorful after this.

 

[Mick96]

So we can assume omega has red color as well

 

[Merppity]

I do love me chapters about colors... in a black and white manga...

 

[Jojeke]

Rare bit of information about Aureole here.

 

[Beastmanga]

Notice Yuri using "chan" when she's talking to Aureole.