As long as we could get fidel castro on boardCompletely ignoring sentimentalities and a lot of logic, in an alternative universe I would like to see a mega merger of Melbourne, North and the Western Bulldogs.
The colours would be red, white and blue, and each team would get 100% of their current colour scheme included.
The guernsey would be a bit like a sideways Cuban flag without the star and more stripes. Melbourne would get to keep their red V yoke, North get to keep their blue and white stripes, and the Dogs keep all their colours.
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It might just be easiest calling them Northwestern Melbourne Football Club and letting a name come organically in the future.
Otherwise, the closest I could think of would be a Cerberus, a three-headed demondog. Two mascots would be represented, and they'd all be symbolically represented by the three heads. Perhaps put the training facilities at Arden Oval, or give the mascot a name like "Shinboner", to compensate them not being included in the mascot.
Obviously, there'd be a lot of collateral damage, but with 140k potential members coming across from the three clubs, it could be the biggest club in Australia.