Of Killer7’s various physical releases, only the USA Gamecube release had a manual that was both in color, and translated. This is the copy I have included here; I did not scan it myself, as I don’t own an american copy of the game. The scans included here have been screencapped from youtuber Supergreatfriend’s let’s play of the game.
Killer7 beta and pre-release trailers
Here’s some beta and pre-release trailers for Killer7. This list is by no means exhaustive or even organized, I’ll just put them up here as I come across them and organize them at a later date.