Films: Hercules (2005)
Alias: The Hydra, the harpies (Stymphalian birds), the Sphynx
Height/Weight: Ranges from that of an average human to a small house.
Summary: Any Greek nerd can tell you what the legend of Herakles-sorry, Hercules, was. A man condemned by himself due to a crime he didn't commit out to find forgiveness by doing the most extreme chores for the Gods, one of which happens to be his father. This story...sort of captures all the beats of this Demigod's journey.
History: Hercules was a young boy who learned early that he was in fact a God on his father's side. In fact, he was the son of their king, Zeus. But as the man trained hard to become a true hero, learning under the tutelage of the centaur Kiron, killing monsters, and overthrowing tyrants along the way, tragedy struck when he was briefly cursed into thinking his family was a bunch of demons, causing him to murder them all. Wracked with guilt, he sought to clear his name by doing some more heroic deeds, no matter the toll.
Notable Kills: Nothing special.
Final Fate: The Hydra gets its heads burnt down while the main one gets bludgeoned to death by Hercules, the Harpies are cut down (even if one's head still lives), and the Sphynx is maimed when Hercules forces it to slash itself to death. As for everything else, the last labor was finishing off Cerberus, who was just some buff guy at Hades' doorstop. What a rip-off. Either way, Hercules had a good end for him.
Powers/Abilities: The Hydra can regrow two heads after getting one cut off, the Harpies can remain alive even after being dismembered, as well as fire metallic feathers at prey, and the Sphynx can shapeshift.
Weakness: The Hydra cannot heal from fire or blunt trauma, and the Sphynx can be harmed by weapons as strong as her claws.
Scariness Factor: 3-Although the Harpies are rather hideous when up-close, the CGI used for all is honestly not the best thing anyone could do. The hydra is particularly embarrassing in this regard, even if it is one of the deadlier foes.
Trivia: -In the original myth, Hercules is able to do all twelve labors (not five), but in the end, he got poisoned by a bad piece of clothing, and set up his own funeral pyre on Mount Etna, where he joined the rest of the Olympians as an immortal. So all in all, not a bad ending, per se.
-Hercules' original Greek name, Herakles, ironically meant "Glory of Hera". This didn't stop the Queen of the Gods from trying to ruin his life in jealousy.