No. The devil does not exist in Greek Mythology.
Hades is the God of the Underworld, the dead, and riches. I would say that is a great deal of responsibility.
Percy starts to feel some empathy for Hades. He thinks maybe Hades got a bad deal.
He made Hades a helmet that could make him invisible.
Hades was being framed for stealing Zeus's lightning bolt, and hades was missing his helm of darkness.
Persephone takes pity on Orpheus, so Hades allows him to take his dead wife, Eurydice, out of the Underworld to live again, so long as he doesn't gaze upon her until they are outside Hades' realm.
The Greeks didn't make Hades. Hades' parents the Titans Kronus and Rhea made Hades.
The cyclopes made hades his helm of darkness.
No
When it's hungry
The Cyclopes made Hades his Black Crown Of Invisibility
That for 6 months of the year, Persephone would stay with Hades in the Underworld. Then, she would get to come on land again.
Hades loved her and so sought to make her his wife alone.