Today I wanted to form Japan as Date, to get thier beautiful grenn color (new feature from Domination for Japan). What was my disappointment when after creating Japan, my color changed to the usual color of Japan. It seems that Paradox has only chosen a few tags that will have their own color after Japan is formed. If you're wondering what those tags are, I've listed them below:

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ASK - Ashikaga (mix of red & purple colors)

UES - Uesugi (white color)

TKI - Toki (light purple color)

SMZ - Shimazu (purple color)

TKD - Takeda (orange color)

SOO - So (pink color)

OUC - Ouchi (beige pink color)

TKG - Tokugawa (grey green color)

YMN - Yamana (mix of purple & dark pink colors)

HSK - Hosokawa (green color)

ODA - oda (red color)

SBA - Shiba (turquoise color)

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I thought any tag in Japan could keep its own color after Japan was fromed. Wierd decision from devs.