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Characters in Hades and Hades II are all taken from Greek mythology, although some with tweaks to fit the story. Most characters only provide conversation and possibly a Keepsake if they are given Nectar. Gods will also grant you a Boon if they are found during an escape attempt.

Hades Wiki

Demeter - Hades Wiki

Characters - Hades Wiki

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Mount Olympus - Hades Wiki

Poseidon - Hades Wiki

Achilles - Hades Wiki

Sweet Nectar - Hades Wiki

Strongbow Hades+BreezeWiki

Bouldy Hades+BreezeWiki

With the announcement of Hades II, how about some appreciation for

Dionysus - Hades Wiki

Just over three months to finish my first knight, an acastus