"Ginga: Nagareboshi Gin" character list - see related link below .
Shaithan, pishaj
There aren't slang terms for people's names.
Saying names in the back slang requires no strict rules.
Speed IS a slang name. It means amphetamines. Click the related question to find more slang.
Poppers
"magic"
There is alot of slang/street names for Hallucinogens like power powder, magic dust, and many more
It's not really slang, but that muscle is commonly called the calf of the leg.
Slang names for a lawyer include hired gun, ambulance chaser, and shyster.
the old ticker
Anal-Attraction