Oh, and one other thing: OIS. I like it and all. But once you activate it, you should be locked in until your BME is depleted (or a scene change, boss defeated, etc), in order to prevent its abuse. The split-second OIS is pretty broken. Require holding for a bit akin to Model A's Giga Crush in order to prevent accidental use.
Speaking of Giga Crush, its BME requirements need to be constant. ZXA really screwed you for gathering the BME upgrades in that department. And there is *NO* excuse for Model ZX to not have a Giga Attack.
Model A should play more like Axl; it feels like a very watered down X.
I dunno, when you get the hang of that homing shot, Model A can be pretty awesome. Porting Axl's controls wouldn't work real well seeings how multi-direction is more of FX's specialty. I like the whole lock-on concept.
But this doesn't mean Model A couldn't see a rapid-fire enhancement. It could fire 2 shots to the button press, one from each gun. But for obvious reasons this wouldn't work when wall-climbing.
Use the old BME system from ZX
NORegenerating BME was the best thing to happen to ZXA. It allows more freedom in the use of BME attacks without the ever-nagging concern that you'll be stuck without enough when you really need it. Otherwise you're encouraged to do without it whenever possible, which was a major gripe with ZX. Also, it avoids cluttering the pause screen, which after A-Trans is a growing concern.
Maybe Model AX. (Model A copies Model X and uses its "special" ability to double megamerge with itself, making a faux Ax.)
If Model A was capable of that, we'd have seen Model X in ZXA.
I think it'd be a lot less convoluted to have a Double Rock On among allies utilize both Chosen Ones. But to expand that, I thought it'd be nice to add some variance based on the host, and which Biometal is their "usual" one.
Example: Aile has X, Vent has Z, they Double Rock On. Vent, normally using Model Z, is more adept with the saber, so we could have the saber transforming into a pistol as we're familiar with. Aile, on the other hand, using Model X would be more adept with the arm-mounted buster, so she would have the inverse: an arm-mounted buster that can transform into a blade (ala Blade Armor).
And, as I've said many times before, I am wholly in favor of Model AX, and the same weapon variance could be applied there. I also believe that besides generally souping up the charged buster beyond Model A, it should also allow multiple Homing Shot locks on a single target.
i'm sick of the Big Four models. i don't want them playable, whether they're by themselves, comboed with X, comboed with Z, or whatever. i'm getting sick of fighting them, too. so if they were to be plot-driven bosses, they better do something interesting with those fights. like have Model W infect them or something, making them HW, FW, etc.
If you don't like them, don't use them. Model X can have its own elemental moves, but I still want the Big Four Double Rock Ons back.
But I will admit, using the Big Four as full-fledged bosses is a real drain on the game's variety; 8 Pseudoroids plus at least 4 MegaMen (6 in ZXA if you include PnP) doesn't leave a lot of room for more diverse non-standard bosses. So I'd suggest booting them to minibosses. The game should not revolve around them, but I do still want them to participate.