Hermes is the original speedster and the messenger of the Gods.
Hermes found his way into Wonder Woman's room aboard the Watchtower. There, he handed her a message from Zeus, which made Wonder Woman and Shayera work together to save Themyscira, Tartarus and the rest of the world.
Although a family tree was not disclosed in the episode "The Balance", Hermes' relatives have been revealed through numerous Greek-Roman mythological references. Hermes is likely the illegitimate son of Zeus and the nymph Maia, which would make him related to most if not all of the Olympian gods and the Titans of Myth. Hera is his stepmother and Hades is his uncle. Ares, Hephaestus and Athena are his half-siblings by Zeus.
In the series, Hermes mentions to Diana that she's "practically a member of the family". In fact, in Greek mythology Hippolyta was the daughter of Ares, so this would make Hermes Diana's great half-uncle and if Hades is truly her father then Hermes would also be her first cousin.
- "Fire From Olympus" (Mentioned Only)