Just some random thoughts and theories about Ackerman Clan.
We do learn from Granda Ackerman that Ackermans used to be a close family to the royals, just like East Sea Clan. What made them different was that they were the shield and the sword of Royal Family. At Chapter 93, we also learn that they are a myth only royal family knows.
At dark ages, Eldia Empire enslaved Marleyans and so told tried to etchnically erased them over 1700 years, of course as Kruger said so logically, this makes no sense.
What if like Eldians were trying to make humans more titan-like, what if they were making experiments on Marleyans like Titan Chemistry Research Society is doing on Eldians recently? And the conclusion of those experiments are Ackerman Clan?
We don’t know much about Dark Ages where Eldia Empire ruled, what we do know is not reliable and changed by many people many times. But R.I.P Eldia Empire and Marley Empire are more alike than any Marley would be able to acknowledge.
Eldia defeated Ancient Marley Empire, relied too much on Titan powers and got defeated by Marley thanks to their super power human brain a hundred years ago.
And now, Marley is cornered at a close situation. They relied too much on Titan power that Mid-East Empire was nearly defeating them with their super power aka developed tech and they also know if they do not stop relying on Titan Power, they are done for.
It is really like a wheel that keeps turning endlessly, one time Marley is at top, one time Eldia.
If those who are at the top of it really did and are crush the ones at bottom, this would be just another piece to show how similar they actually are.
So what I am saying here is what if Ackermans actually Marleyans that somehow got injected with Titan powers? That would explain a lot. That would explain why King Fritz can’t control them even though they are not Eldians yet how monstrously strong they are even though they are humans. Not Marley, not Eldian, something in between. Outcasts that can’t be controlled other than one thing.
I wonder if the actual reason Ackermans have lieges is to keep them under control. They can reach the great power that lies within them only if they choose a liege they are going to serve under. They gain a great control over their body and mind in order to be under control of that one person.
For a long amount of time, these people were chosen from royal family. After Ackermans rebelled to King with East Sea Clan, they also gained the freedom to choose their own liege yet they still are the slaves of their great strength and their lieges thanks to blood running through their veins. Yet again, they still have free will and they still can make individual choices. Maybe, the hanged Ackerman chose to give up on his life and the status Ackermans have within royals and chose to rebelled to gain this freedom. Even if it is just a little bit.
It would be fitting to learn that Ackermans are some kind of genetically changed Eldian - Marley hybrid instead of super mysterious magical winged ninth titan.
Just my two cents.