Veilhorn Steed

Overo

OO / nO

Unlike in real horses, characters with homozygous overo (OO) are perfectly healthy, and will not die from what is usually known as "lethal white".

Effects

Skin: skin will be light pink under any white patterns
Horns and hooves: hooves will be light where white leg markings connect [Horn & hoof color guide]
Eye color: eyes can optionally be blue even if white facial markings do not reach them, and will always be blue if white markings do reach. [Eye color guide]

White patterns cause a lack of color pigment in the coat, resulting in pink skin and white hairs. Skin will always be pink under white markings, even if blue dilute is present.
Modifiers, Dilutions and Patterns must always go under white patterns, and are also not allowed to "appear" to go over white patterns.
Can generally cause blue eyes if the white markings reach the eyes, unless otherwise specified.
Hooves and horns will be lighter when affected by white.
The minimum expression of each white pattern (except natural white which is optional) can only be reduced with Occlusion, which can partially or fully "turn off" or hide genes.

Appearance

Overo (also known as Frame Overo) causes irregular white patterns on the sides, surrounded by a "frame" of the base color of the horse. Overo is never allowed to touch the topline/spine past the withers.

At minimal expression overo needs to have at least one white irregular spot somewhere on the body, either on the belly/barrel or the neck. Socks and face markings are not required.

White markings on the face and legs are optional, overo white markings are allowed to extend down the legs but it is not required.

Minimal overo

chestnut + overo

Overo

chestnut + overo

Maximal overo

chestnut + overo

Optional effect: Badger face

Both sabino and overo can have the badger face marking, causing the white facial marking to have occluded spots, appearing as reversed blazes or white stripes along the sides of the head.