I still need to watch that... I heard it's really good.

But to answer your question, I don't think Kaneki would use something like a wish willow just to make the reader fall in love with him. Even at his lowest points, he craves genuine connection, not affection that's forced or magically manufactured.

Honestly, I don't think much would change.

Kaneki has never really been the type to judge people based on age alone. What matters to him is how safe he feels around someone, whether they really understand him, and if they can accept the darker, more complicated parts of who he is. An older partner might actually appeal to him because there's often confidence and emotional stability that comes with experience.

The age gap itself might make Kaneki a little self-conscious at first, wondering if he's good enough for his partner. Having an older, more established partner could amplify those insecurities, leading him to worry that he comes across as immature or inexperienced by comparison. But if the relationship were healthy, that concern would fade as trust grows.

I’m still mad that White Suit Kaneki never got animated.

We were robbed of this!!!

I agree.

Kaneki spent months/years adapting to a life where violence, hypervigilance, and predatory instincts were necessary for survival. Suddenly removing the ghoul side doesn't erase the trauma that created the Shiro persona (Not sure what the Akaneki persona is). In fact, it might make the conflict worse because now he'd have all the memories and instincts of a ghoul trapped in a body that can no longer act on them.

As for Haise, even if he kept his intelligence and leadership skills, he might question whether he still deserves his position when the trait that made him exceptional is gone. That insecurity could hit him hard because he already struggles with identity and self-worth.

Reader's role would be very important throughout all of this because they would help Kaneki learn how to live as a human again. Things that once seemed ordinary—eating human food, going out in public without fear, or settling into everyday routines—would become milestones.

I would want to make him kabocha, miso and fish stew with rice.

Or, even though he’s a ghoul, his s/o could still try to make something for him using human meat from Anteiku to try and normalize eating human flesh for him by disguising it as other food like meatballs or steak… which of his personas would eat it for them and which would be unable to stomach it? Is the problem knowing what the meat is, or knowing he can only eat an imitation of a human dish?

I put the responses below the cut since it was getting too long. Not sure if they’ll fully meet your expectations, but I hope they’re alright anyway.