The Endless are beings of balance, the embodiment of one thing and its opposite. Unlike the gods, who represent one thing and require someone else to serve as their foil, the Endless are the totality of a concept, both ends of the spectrum. Destruction described them as lords of opposites, but really, they just represent the concept. They are neither heads nor tails, they're the entire coin.
Maverick- Destiny and freedom Riah- Death and life Mordred- Dream and reality Malachi- Desire and hatred Mildred- Despair and hope Mara- Destruction and creation Mabuz- Delirium and sanity Malcolm- Delight and dismay Mavis- Determination and hesitation Midnight- Darkness and light (metaphorical) Morrigan- Dawn and dusk (metaphorical) Mora- Diversity and homogeny Molly- Deviation and conformity