What would I bring back?
From the "Raven" games:
-Overall movement mechanics and general rules. I don't care much for quickboost and how it's become the primary form of movement. If it were tweaked to be a last-ditch evasion, maybe, but overall the movement should go back to the old games.
-Shoji Kawamori as lead mech designer. Having too many people with radically different design styles isn't a terrible idea, but if fA is anything to go by, it can lead to some really unappealing combinations, aesthetically. Having Kawamori as the main designer would alleviate a lot of that, and have another guy come in to do more unique parts for the "smaller, 3rd corporation" i.e.: Balena, Kisaragi, etc.
-Simplicity. The games were complex enough, and all this extra complexity they've added in 4 and V just seem arbitrary at best, and really screw the meta at worst. In the old games even with OP parts there was a wide range of ways to utilize them, but there weren't really the "cookie cutter" designs we've seen with ACV, where several ACs have identical builds. In this case, less is more.
-LOCAL MULTIPLAYER. I cannot stress this enough. One of my favorite aspects of games is having friends over and playing together. We'd spend hours in the PS2 games battling and refining our builds. AC4 made that difficult, and ACV made it impossible. Its likely that no matter how good AC6 may be, if it doesn't have local multiplayer, I won't get it.
-AALIYAH-style parts. Head especially.
-A few aesthetic things, like the slide-barrel revolver grenade launcher. Not much game mechanics-wise though.
-Special multiplayer super-bosses. These were a cool idea, and what Arms Forts in fA should have been. It always bugged me how easy AFs were to take down, so when I saw a video of the ACVD raid on the Motherwill, I thought "THIS is how it should have been", so keep that aspect for sure. Hell, make the Motherwill a recurring theme, like how several games have nots and allusions to Nineball, do that for Motherwill too.
-Customizable garages were cool. I liked being able to do that. I thought it added a bit of depth to how the player could view his pilot character and how he/she would act by determining what kind of garage they would have. Being able to unlock special ones by beating multiplier bosses like mentioned above would be cool, I'd like to see my AC being assembled on the Motherwill.
-Emblem creation system. Probably the best I've seen in the series.
-Clan support, but should not be a requirement. Having a clan to join is cool, but needing them to all be active all the time to accomplish anything is not.