Keep playing Kaiser?

I'm still enjoying my Kaiser to this day. As for Mihile's link skill, why not get a mechanic to level 100 for the +15% buff duration card? I find I can use Mihile's stance, then use Echo and then Majesty to reset their cooldowns; the cooldown of Majesty would end before the Mihile buff would even run out, allowing you to use it again and use Majesty to reset it again.

As for attack speed, try getting some green potions from the MPE bosses at the very least as those are easy to obtain. I can see SI gloves and the +1 attack speed line from Aswan being troublesome but it's very worth it in the end.

As for damage, they're not really lacking much anymore, especially after this buff we received. 280% damage per hit of Gigas is nothing to scoff at and Sword Strike was buffed significantly; when training on a big map, it's not a bad idea to switch between Sword Strike and Barrage (for example, you would use Barrage and while it was still under the delay, throw in a Sword Strike and then use Barrage to keep moving and repeat this process.) and his mobbing is good as well when transfigured too. Kaiser's are still great bossers while Wing Beat just makes our dps that much better; the most optimal use of Wing Beat would be to throw one, then attack once or twice with Gigas or another move while Wing Beat was under delay and then throw another and repeat the process until 3 were out at once. After the 3 Wing Beats are out you would keep attacking with Gigas or your move of preference until the Wing Beats would start disappearing and you would repeat the Wing Beat process.

Oh, and status resist (I currently have 99% resist ) and DR ignore are blessings. I've mained most of the warrior classes except Hero and Pally and I find I like Kaiser the best of all of them. Demon Slayers have DR ignore for a short amount of time while maintaining the status resist Kaiser has but I can't say much for it outside of that even though I mained it at one point. Dark Knights aren't bad and they have some fairly good dps and can ignore DR for a while after a death but it has a rather large cooldown so you can't really take advantage of it all that much and their status resist is rather lacking.

Well, I hope that helps. Kaiser is far from lacking though.

I have a mechanic, actually. The only thing I didn't know is that majesty reset the cooldown on Mihile's link skill. Now my only problem is that I need to free up another link buff for my Kaiser. Now that you pointed that out, though, I think I'll stick with my Kaiser for the forseeable future. Even if I liquidated him, he's got enough untradeable stuff on him that my other characters would just be worse anyway.