This summary doesn't really do it justice - the first book in the series is at https://www.amazon.com/Ancillary-Justice-Imperial-Radch-Leck.... Oh and written by a woman too ;)
I think it's quite clear that the human bodies have their original personalities wiped and become nothing more than tools of the original AI.
And the supreme leader is a form of distributed, multi-brained intelligence
The "Newsflesh Trilogy" by Mira Grant (Seanan McGuire). I'm not usually into zombie fiction, but this was a great series. Not your typical zombie fare... more like a political / conspiracy thriller where zombies are just part of the trappings of the story, not the focus of the story. Hard to explain, but worth reading.
https://www.amazon.com/Dawn-Xenogenesis-Trilogy-Book-1-ebook...