Tell me what you think the coolest battle would be, between any two animê characters, from any show?

Heh, so many good options. Kizaru vs. Minato would be a pretty incredible battle of speed demons. Just for the sake o both characters being awesome, I'd amor to see Doglamingo vs. Kimblee, since I figure their conversations alone would be epic. But if I had to choose just one, I'd say I need to see Yamamoto vs. Madara. I think that would be insane, just a whole other level.

This is something I've already thought about. Erza Scarlet vs. Kanzaki Kaoru would be heaven shaking the moment their weapons clashed. A strategic/tactical fight between Gasai Yuno and Light Yagami would be beyond thrilling. Accelerator vs. Izayoi Sakamaki would be worth it just to see the two confronting each other. We all want to see the Neon Evangelion mechas against the Gundam mechas, though I think it's no contest. I would also like to see Light Yagami against Lelouch V. Britannia, since those two seem so similar, I swear they were based on each other. Kurogane vs. Roronoa Zoro is a dream sword fight of mine along with Black*Star vs. Elizabeth Midford.

But we all know we want super-homem to meet Goku. One of these days, it's going to happen. It's going to happen and the world's going to end from the epicness. Just you watch.

For me it would be Itachi Uchiha Vs Sōsuke Aizen because I would amor to see complete hypnosis vs the Mangekyō. And Aizen Ascension Vs Itach Susano'O and Amaterasu...
Both are also Intelligent so it would be interesting to see them interact. The rest I'm about to mention is just because I amor the characters abilities: Toshiro vs Tobirama, Soi fon vs Konan and Byakuya vs Guren.