|“||The door out of Stable Two was closed and sealed. Only the Overmare knew the secrets to opening it, assuming it even could open.||”|
– Littlepip's Monologue
An Overmare (or Overstallion in some cases) is the leader of a Stable-Tec Stable. The Overmares were often aware of the Stables being an experiment and helped coordinate it. The purpose and appointment of an Overmare varied depending on the Stable.
Stable 2 Overmare - She was the current Overmare when Littlepip and Velvet Remedy left Stable 2. Her real name is not mentioned by either of them.
Stable 24 overstallion- He was the current overstallion of stable 24 when the chimera were created.
In Other Stories
Stable 99 Overmare - Allowed Deus access to Stable 99, when she felt her reign/control over the stable was slipping.
Stable 66 Overmare - Used cybernetic implants to try and take total control of the stable dwellers. Turned the ponies inside into a hive-mind whose goal was survival and expansion.
Morality of Property
Shimmercoat - He was the Overstallion of Stable 11. Broke the traditional cycle of sacrifices by using captured wastelanders.
Stable 17 Overmare & Overstallion - Stable 17 had a pair of ponies managing the stable, instead of a solitary leader.
Stable 88 - Blueberry Muffin was the first Overmare. Her descendant, another Blueberry Muffin was also Overmare.
Stable 69 (probably Stable 61?) - Unnamed. She is a pegasus who exiles Snowflake for uncovering a relic of 'Old Equestria', which is against the Stable laws. Described as having more of a winning smile than a beautiful one.
Stable 75 - Sweet Cheeks is both the Overmare and the hotel manager of Stable 75 in Stable Town.
Behind the scenes
The Overmare is a reference to the Overseer,the leader of a vault in the fallout games.