Well he came to me in a dream once, which ended up turning into a lucid dream, I can tell you that he has a wild personality, sort of like how an adult might act childish in some areas, never the less he should be respected. I would offer him some wildflowers, despite him being king of the underworld he has a thing for different colors. But this is what i got from him.
Hades is very serious. If you dont have a specific reason for communicating with Him, He will most likely not respond to you. The first experience I had with Him was extremely intense. The second one was an offering of pomegranate seeds, and they rotted the next day. Be careful, and know what you're doing. Blessings.