The Rune Knight is fantastic! It's not quite clear if the short rest recharge is for the Knight or the person who used the magic of the rune? Since, I assume, you can use them on allies' gear as well. There's potential for some shenanigans if you keep passing around the runic knife to say get over an obstacle or something but that's part of the fun I think.
Swarmkeeper is a fun concept, didn't really interest me so I haven't dug too deep into it for now.
The Revived... I'm not really feeling the Rogue aspect of it. This feels like a class-less subclass or something that everybody should be able to take... it's just...weird. Heck, it feels like something you should discover at 1st level not suddenly stop eating and drinking at 3rd.