I would want it to be a somewhat open-world game in the style of Hulk Ultimate Destruction. You would get to make your own Maverick Hunter and respond to Maverick related incidents around the city or other outlying areas. The game would focus on what the rest of the Hunters are doing in their daily tasks while X and Zero go off to handle the larger threats. It would show the Hunters as a genuine team.

The game would feature an upgrade tree that allows you go focus on speed, power, or gadgets for your playstyle. Speed focuses on personal mobility and traversal, making you into an untouchable ninja by the end. Power focuses on increasing your combat ability, turning you into a fighter rivaling Zero by the end. And Gadgets would allow you to perform a number of technical skills and abilities, such as summoning vehicles, support animals, laying traps, and other gadgets to help you fight indirectly. You can of course double dip into any of the three skill tress to make a Hunter to your liking. By the endgame, you can master two of the trees and leave one empty, or split your focus into all three. Post-game and New Game+ allows you to master all three simulatenously.

You'd be able to call in for backup, summon Ride Armors, and cruise around on Ride Chasers as you keep peace in Abel City. You have the choice of either retiring (killing) Mavericks, or capturing them and bringing them back to HQ to be purified and released. Killing is much easier, and sometimes your only option, but capture and purification is harder and typically yields better rewards.

Buildings and environment would be destructible, but since this is the far off future of 21XX, can be replaced quickly. Causing collateral damage counts against you after a mission, encouraging you to save as many lives and stop as many mavericks as possible while keeping the overall health of the city as high as possible.

It would take place after X3, but before X4, so that Repliforce can also participate as the "military." The plot would revolve around Berkana going Maverick and experimenting with Reploid DNA Souls creating monstrosities that threaten the city and other areas. After her defeat, she retreats to Laguz Island to set up the events of MegaMan Xtreme 2: Soul Eraser, where X and Zero thank you for your hard work and head off to stop her for good.