Bodyguard/henchman to Eurystheus, former River-God

Oceanus (father), Tethys (mother), Coeus, Crius, Cronus, Hyperion, Ophion (uncles, Titans), Ceto, Dione, Eurybia, Mnemosyne, Phoebe, Rhea, Themis (aunts, Titanesses), Actaeus, Acheron, Inachos, Ladon, Scamander, Simoeis, Sphericus, Strymon, Termessus, Tiber (brothers, river-gods), Callirrhoe I, Calypso, Clymene, Doris, Electra, Eurynome, Metis, Perseis, Ortheis, Philyra, Styx (sisters, Oceanides), Cronus, Japet, Nereus (uncles/brothers-in-law), Pallas, Zeus (cousins/brothers-in-law), Perimela (first wife, deceased), Callirrhoe II, Peirene, Castalia (daughters by Perimela), Melpomene (second wife/cousin), Aglaope, Himeropa, Ligeia, Leucosia, Parthenope, Peisinoe, Thelchtereia (daughters, The Sirens), Calliope, Clio, Erato, Euterpe, Polyhymnia, Terpischore, Thalia, Urania (sisters-in-law/cousins, The Muses), Athena, Aegina, Aglaea, Daphne, Echo, Euphrosyne, Nike, Syrinx, Thalia, Iris and the Harpies, (nieces) Orpheus, Bia, Kratos, Zealos (nephews), Aphrodite, Asteria, Demeter, Eros, Hades, Helios, Hera, Vesta, Leto, Poseidon, Selene (cousins)

Eurystheus (ally), Olympians (Greco-Roman gods)

Unrevealed

Height
6'2" (variable)

Weight
595 lbs.

Eyes
Brown (human form); red (bull and snake forms)

Hair
Brown

Achelous possesses an Olympian gods conventional superhuman attributes, but with enhanced strength (lifting over 90 tons). He is a methamorph capable of assuming humanoid, bovine, and serpentine forms. However, the hybrid forms that he often is that of a humanoid bull (resembling a minotaur) with a serpent tail.

He is a skilled hand-to-hand combatant, often using his horns and tail as offensive weapons.