Stealth, disguises, the signature suit, silver ballers and barcode, things like that
Its hard to answer this because I know very little about the video concept.
You could go with one of the classic hitman colour schemes, like black and white. Or maybe black and red like the newer games. You could even try to make your own colour scheme, but I’d say that one of the colours should probably be black to match up with the history of the franchise