Ancient races consist of humanoids with physical (and psychological for some) traits of animals and legendary creatures in our world who makes up the majority of Terra's civilization. Some Ancients closely resembles our world's humans (human-like) while others closely resemble the animal their traits are taken from (animal-like).
Certain human-like Ancients have two pairs of ears, one human and one animal, and both are functional; it is unknown how this would affect their hearing.
- During an interview, Hypergryph confirmed that "true" humans (like those of our world, or Homo sapiens to be exact) did not exist in Terra.
- The producer of Arknights, Hai Mao (better known as lowlight kirilenko, one of Hypergryph's founding members and the illustrator of 12F), confirmed that each race have their own lifespans with a completely different process of maturity than the humans of our world, which is the reason why characters' ages are not stated in-game.