I feel like I want to get this out before the Sonic/Mega Man Worlds Unite arc comes out.
At Fan Expo 2012 I met Ian Flynn, and shared with him some ideas for Sonic/Mega Man crossover stuff. I feel like I should post what I shared with him here. Anyway, here's some stuff I shared with him.
1.I felt like maybe Bunnie should be given Mega Man's weapon copier ability.
2.If the ZX series is ever used, it would be revealed that former robians are able to perform the Megamerge with the biometals due to molecular remnants of their time spent as robians still being inside their bodies, which the biometals would use to perform the Megamerge with them.
So, those are my ideas for Sonic/Mega Man crossovers.