It's time for another Olympian-centric list.
Ares: Area, or Mars, is the Olympian god of war. He was a member of the Dark Avengers. Ares would fight using a wide variety of weapons, and should have a passive strength and armor boost.
Dionysus: Dionysus (also known as Bacchus) is the Greek god of partying. One of his powers is to make people go crazy. He should be able to use this in missions to cause enemies to attack each other.
Hera: Hera is the Olympian goddess of marriage, and is also called Juno. She, along with other major Greek gods, should be playable in SHSO.
Zeus: Zeus is the king of the gods, the god of the sky, and Hercules' father. He also goes by the name Jupiter. He is essentially the Greek equivalent of Odin. He is the most powerful Olympian god, so he should be one of the game's strongest characters. Zeus' attacks would need to involve the summoning of lightning.