Whist we were discussing teh cracks
I've completely forgotten to mention the one that never fails to send shivers down the spine Madara x (Hashirama) x Mito
I especially cherish the twisted idea of the above, when they BOTH pretend the other one IS Hashirama.
Just feel it.
Inspired by this artwork
Madara Uchiha & Mito Uzumaki © Masashi Kishimoto
Also, it's one of these instantaneous on-the-spot ideas that hit you mercilessly and demand immediate implementation no matter the workload