User blog comment:Lord Loss/Monster Hunter Frontier G 2 Discussion/@comment-6050823-20130828112616/@comment-6050823-20130828212407

Red Form = Power/Brute Mode

Blue Form = Speed Mode

Black Form = Long Distance Form

White Form = Normal Mode

Blue Ash Form =  Power Mode + Long Distance Form

Black and White Form = Speed Mode + Long Distance Form

Also it seems that in G3, there maybe a stronger version of the G-Rank Unknown.