This would be a first for me. I've never had a ship between two universes.

I found a fan art placing the two together and I just couldn't resist. Diarmuid is a loyal, valorous hero of knightly honor. Mami is a kind, compassionate soul who honorably defends the world from witches. The two are an excellent match and due to both of their shows being made by Gen Urobuchi, I wouldn't be surprised if they were based on each other personality wise.

Yes, Diarmuid x Saber is still dominant, but this is adorable. Plus the two die gruesomely. Oops, spoilers! Que the Mami puns!