Tatsunori Ishikawa and Nagaki, I think it's very important that you look at Super Double Dragon for the SNES in terms of gameplay. It is considered by MANY fans as the best DD in terms of gameplay possibilities and dynamic movements and attacks. Bringing the city where the game's event is taking place to life, just like in River City, having exposure and discoveries in its parts would be another very important thing for fans in terms of innovation. Since this was always used in RC and never in DD. This would make it possible to have several different Gangs (another differentiator) fighting over territories and would make an interesting progression for the protagonists in conquering territory throughout the game's progression. Allowing for choice of where to start the game, etc.

Battletoads/Double Dragon.