Soulcalibur Saga: Uchiha Dynasty

Soulcalibur Saga: Uchiha Dynasty
Soulcalibur Saga: Uchiha Dynasty is a 20 chapter Naruto Shippuden and Soulcalibur crossover made by Ryuu the Ancient Keyblade Master which stars Itachi Uchiha.

Itachi is sent into the 16th Century where he learns about the Soul swords and goes off on a quest to get these swords for the Akatsuki. He encounters many of the cast from Soulcalibur (some of them are killed by him).

He gains the Soul Calibur after his fight with Siegfried Schtauffen which turned into a Ninjato version for Itachi.

Itachi becomes rivals with Nightmare, Tira, Raphael Sorel, Yun-seong, Maxi, Kilik and Sophitia Alexandra through chains of events (mostly all of them are just events that resulted in Itachi burning down a building).