Below is a list of sources where you can get an idea of various concepts of the game. If you think you've got something that would be good to share please comment (include what aspect you think it helps with).
Movies/TV The Warriors - Basic gang war premise The Purifiers - Basic gang war premise Ready Player One - The avatar and basic concepts of the Net Anon - Augmented Reality Dark Angel - The general gritty future concept (some cybernetics) Blade Runner - The general gritty future concept
Books Ready Player one - Same reason as the movie, but better.
Games Deux Ex (Both Games) - Cyberwear It's not out yet but Cyberpunk 2077 - Clearly
Other Cyberpunk (RPG Tabletop) - Basic game setting Shadowrun (RPG Tabletop) - Basic game setting (without magic and elves)