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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.

Poseidon - Hades Wiki

Shield of Chaos Hades+BreezeWiki

Mount Olympus - Hades Wiki

Zagreus/Gallery - Hades Wiki

REFERENCES - Issuu

Persephone Hades+BreezeWiki

REFERENCES - Issuu

What style of dress is Nyx wearing? : r/HadesTheGame

Nemesis - Hades Wiki

Bronze Skin - Hades Wiki