I read your ackerbond metas and if I really think of it Mikasa and Levi's lieges are like a temporal fix. Maybe it makes sense for a knight to dedicate your life to a king's ideology forever but ordinary people aren't like this. You change, your perception changes, and people lie. Erwin is not who Levi thought he was, and if Kenny knew Uri was a slave to his powers he wouldn't have followed him. Mikasa wasn't fully grown when she dedicated her power to Eren and Isayama says she'll depart him
Temporary* forgive my auto correction I’m on mobile Dx
I sorta liked “temporal” :)
If you ascribe to Death of the Author, I can see where there could be some room for “what ifs”. What if that person dies, what if they change their mind? The manga hasn’t, and probably wont, cover all possible details of the Ackerbond.
But if you accept supplementary material like interviews with Hajime Isayama, we’ve gotten a clear picture of his authorial intent - that is the bond is the most important relationship if their life, one involving choice, instinct and lifelong devotion. Ackerman are not “ordinary people”.
I’ve discussed this here. Mikasa bonding with Eren as a child does present some unique challenges. Isayama considered a separation so Mikasa can develop individually, but knows that is something canon Mikasa wouldn’t want.
I think it is pitiful if Mikasa’s life is only about staying together with Eren. However to Mikasa, it is a wonderful thing to be with Eren forever.
So according to the interview, canon Mikasa would never want to separate from Eren. Even though it was a childish decision, her life is devoted to him.
Isayama did mention having her face a choice between “the right thing” and “the eren thing”. Mikasa giving up in the fight for Armin on the roof may have been what he was hinting.
We have a full life story in the manga. Kenny chose Uri and followed him the duration of his life. When Rod made a disparaging comment about Uri, Kenny nearly slit his throat. The bond was still there.
As far as any regrets, we can look to the manga. As Kenny lay dying, he was remembering Uri and talking to him, even telling Levi about him. Kenny didn’t seem regretful. He seemed inspired.
In the recent Guidebook interview, Isayama says that giving the serum to Levi was the first selfless thing Kenny had done. In doing so, I’d like to think it was a moment where he attained something close his goal of reaching Uri.
Levi was an adult man when he made the decision to “devote himself Erwin”, the person “whose existence exceeds that of Levi’s own” The interviewer specifically asked about Levi’s mindset once Levi learned Erwin’s goal had an element of selfishness.
To Levi, they had shared a promise to “save humanity together,” so his first thought is, “This guy’s words…why are they different from before?”
And even though Levi still didn’t understand things fully after discovering how Erwin had childlike motivations, he leaned towards the attitude of, “Alright then, let me help you anyway” rather than distrusting Erwin.
From the more recent Guidebook
When he discovers that Erwin actually has a selfish goal like his “dream,” it can be said that he felt betrayed. However, he also recognizes that this person whom he cannot hope to surpass actually has “an innocent, childlike side that chases dreams.”
The interviews have let us know that Levi accepted this part of Erwin and continued to support him unconditionally.
There’s also this - the face says it all.
All of this being said, you’re absolutely welcome to believe what you want. Many people choose to view the Ackerbond within the confines of the manga. That’s fine. The manga provides solid indication of the intense and powerful dedication each Ackerman feels towards their chosen person.
Thanks for the ask!