Which Combattant (betta) breeds come in Uni?

Club breed standards describe Uni for the Combattant.

Combattant (betta) pattern

Uni

One color all over with no pattern or white: self in rabbits, cavies, rats and canaries; a tongue or hoof of one even color.

9 Combattant (betta) breeds list Uni. It is in a club standard for 1 breed.

Breed	IBC
Combattant	Standard (“Solid”)

Breed
CombattantQueue en voile
CombattantDemi-lune
CombattantQueue en couronne
CombattantPlakat
CombattantDelta
CombattantDouble queue
CombattantQueue en rose
CombattantOreille Dumbo

How Uni can appear or change over an animal's life.