In this day in time most people view Hades as a evil and demonic god.
hades today is all the wrong doing in this world today.
This affect the culture as the culture you adopt must be in line with all the factors.
Greek.
pluto is the roman equilvent to hades
There various ancient civilizations that most affect US culture today. Some of them include ancient Greek, ancient Roman, Mayan and so many others.
The Underworld.
nothing
Hel is the goddess of the underworld in Norse Mythology. She would be Hades equivalent.
There is a magazine named after him, the saying "Hotter than Hades" however this saying is very incorrect, the three headed dog in Harry Potter is his pet, possibly portrayed as Voldermort, the Lightning thief series is based of greek mythology and the first book is about the abduction of Persephone by Zeus and Hades.
The devil
Hades is older than time, he was born before time existed.
He had many, the most recognizable today are; Cerberus The Helm of Darkness Keys to Hades