Kinda too late at this point in the game to give out anything really substantial for Legacying, but if Naughty Dog had come out to me, this is how I would've handled the Legacies:
-Legacy 1 would've given out all the Neg Boosters plus some new Buddy Boosters and those weird Lucha and Highwayman masks. Plus scope zoom mods for the M9 and AK in co-op as well as new Co-op Boosters and Kickbacks.
-Legacy 2 would've given out the Clown Masks plus Doughnut Drake and Talbot.
-Legacy 3 would've given out the Skeletons (instead of grinding for them like in the final product) plus special Bone gun skins for them to use, as well as Navarro, Gabriel Roman, and Lieutanent Draza skins.
-Legacy 4 would've given out Harry Flynn, Eddy Raja, and Lazarevic.
They would come with the sideguns Flynn's Raffica, Eddy's Tau, and Lazarevic's Para 9. Flynn would also get a three-mod Dragon. Using Flynn's Raffica plus his new Sniper, Eddy's Tau plus his AK, and Lazarevic's Para 9 plus his Fal-SS would give them a third buddy booster trick involving the Buddy Boosters created for Legacy 1.
-Legacy 5: Baseball Shirt Drake (I refuse to call him Redshirt Drake), Wetsuit Elena, Daniel Pinkerton, and Rika Raja. The Naughty Dog AK + Para 9 for everyone as well, in case one didn't get them during the Subway Beta.
I don't understand why scope zoom is there.