Nemesis

Nemesis (Νέμεσις in Ancient Greek) is the Goddess of retribution and vengeance. Her Roman counterpart is Rivalitas.

History
Nemesis is the daughter of Nyx, the primordial goddess of the night and Erebos, the personification of darkness and shadow. She appears chiefly as the avenger of crime and the punisher of hubris. Her name in Greek means "to give what is due" therefore giving her the nickname Justice.

Percy Jackson and the Olympians
Although she was not seen in the series, she was mother to Ethan Nakamura, and sided with Kronos when faced with choosing between siding with the Titans or siding with the Olympians. She gets her own cabin after The Last Olympian. She doesn't play a major role in the series, besides being the mother of Ethan Nakamura. At some point she made an exchange with her son that he would give up his eye in exchange for bringing minor gods respect and power. Ethan gave more than his eye, but the minor gods were given their own cabins and general amnesty around Olympus.

Personality
As is expected from the goddess of vengeance, Nemesis is a cold and cruel goddess. Her ruthlessness is exempt from no mortal including her own children as shown when she took her son's eye as a price. However, Nemesis does have a strong sense of honor as exemplified when she swore to her son, Ethan, that he would gain recognition. She also seems to be fair because Ethan says that she always pays her debts, no matter if its good or evil.

Known Children

 * Ethan Nakamura (deceased)

Trivia

 * Nemesis is now often used as a term to describe one's worst enemy, normally someone or something that is the exact opposite of oneself but is also somehow similar. For example, Luke is frequently described as the nemesis of Percy.
 * Nemesis is the goddess of balance, she makes sure no man has too much good in his life to prevent hubris. Her symbol is a set of scales. She is never mentioned giving happiness, relying on other gods for that. Her purpose is usually to give misfortune to prevent too much happiness; therefore creating an equal balance.