Second question first! Aku’s canon death won’t stop me from playing him. Sorry, Aku, but you don’t get to rest in pieces yet. I had a couple explanations in mind for this. One was that the effects of time haven’t yet caught up to this Aku. The other explanation (and the one I’m going with) is the good ol “alternate timelines” excuse. This Aku had a “vision” of his demise so he is aware that it happened somewhere in some other timeline.
I really like the idea of Aku going an inter-dimensional-Voldemort route where he splits off parts of himself and scatters them in different points along the spectrum of time or in alternate timelines to ensure his survival. This would have happened immediately after Jack and Ashi jumped into the portal to take Jack back to the past. I was wondering what future!Aku did after he let Jack and Ashi get away and this is what I like to imagine happened.
As for my thoughts on the finale: I have mixed feelings!
To me, the finale itself felt more like Part 1 of a 2 part finale. I think if the team had been given 13 episodes to work with rather than 10, season 5 would have been perfect. I feel like a lot of the pacing issues would have been resolved.
That being said, when you are working with 22 minutes for a finale, every minute is precious and I felt like a lot of time was wasted on things that were cute but ultimately not necessary. However, I did like Mako’s little cameo and thought that was a nice touch.
There are some things I would have done differently if I could design my own finale. I would have shifted to a darker tone about halfway through. I would have let Aku be more competent and a lot scarier. I would have had a scene where Jack and Aku exchange dialogue. I would have had a duel between Jack and Aku. I would have let Ashi live, but in her own timeline. I would have let Aku live, forever imprisoned in sword-dimension with Jack’s righteousness as his constant immortal nemesis. I would have had Jack’s real name written in Kanji somewhere as an Easter egg. I would have had a brief epilogue where an older Jack encounters the Guardian in his new future but we wouldn’t see what happened.
So basically my finale would have lasted 3 hours, oops.