Well idk why I haven't thought of this before but why not add the ability to select highlights and lowlights when choosing hair color?
Also, don't do the invincibility upgrades again. Saints Row is enough of a cakewalk for me as-is.
And another thing, expand the amount of players that can be in a co-op campaign. Consolization certainly is no excuse anymore since both the PS4 and Xbox One support up to like 12 controllers on the same system.
Speaking of multiplayer, not saying copy GTA 5 here but something like GTA Online would be awesome. At least give the ability to make dedicated co-op free roam servers on pc, and then work from there.