I think The Nameless Samurai isn't a very good name for an evil king. I mean, if you were the sole ruler of the world for thousands of years, you'd probably get several different names and titles (Master of Masters, Deliverer of Darkness, etc.). I don't know, but I'd probably go wit something like "The Shogun"; it keeps the mystery, but also gives him a title that implies dominance and martial prowess, and has some of that "Emperor of Mankind" his-real-name-has-been-lost-to-time quality.

Besides that, I'm loving this AU and I'm really looking forward to whatever she has plans to do with it.

i actually want to see this spinoff be made a reality, aku is arguably the best part of the samurai jack franchise, so seeing him as the protagonist would be hilarious and awesome.