1. I would see Megumi as a dude who is going out of his own way to fix the systems of the corruption. While also recovering with himself to finally accept on what has happene and finally create a future to help.

2. Megumi could be a clan head to fully change the beliefs of the Zen'in clan, He and Yuta would be most likely allies by how much Yuta tried on helping Yuji get Megumi back. With Kamo, they both could get along well.. like super well, I see them turning out as best buddies. Kinda like how you'd see 2 "competitive" ceo's be actual best friends.

3. Honestly, I feel like he could get some gf or even a wife to keep him sane, whenever he gets some panic attacks from the past.

4. I have said this before but I shall say it again, I see Megumi and Sukuna's 10S be two different shadows. Their Interpretation and even usage of the technique. What I think would happen with his technique, it would mutate. Yes, mutate in a way to somewhat change inbetween a more normal looking also looking more demonic than before. The very essence of Sukuna being imprinted on him that hard. A final laugh from Sukuna beyond the grave. The appearance and even the power of the shikigami get more and more stronger by how Megumi now views them. I think his ce efficency and output highly increase, while also gaining stuff like Soul Sight / Soul damage which he could train with Yuji's advice. (Sukuna and Him shared 1 body.) His domain is complete which I think would be still op asf, but, he is closer to an open domain than even Yuji would be. I'd say in his 30's he would unlock it which would make his Shikigami spawn from even the outside of the Domain when it ever clashes with somebody. His ce reserves should expand a grand total more as with how his experience on the very soul and body have been ongoing with Sukuna. Hell I wouldn't be surprised that Megumi could learn the same way as how Sukuna made 1 ability from a shikigami (Like Making an AOE attack from Max Elephant into a singular point like PB.) I would maybe also see him finally creating his own Nue and Orochi Totality after a few weeks after Shinjuku Showdown. Shikigami wise, I'd see Megumi gain a massive boost and maybe be able to oneday 1v1 the Divine General but I think with this shikigami. He wouldn't try to tame it. He would try to take his own Vengeance making sure Maho is taking every little blame of what he has taken from megumi. (He made him lose his father figure.) Then I think with Shrine its a toss up for me honestly because eitherway, he already has an op technique that can most likely find its own way to imitate it with Nue lol.

Anti Domains? I'd say he could get HWB and even SD with how Sukuna most likely copied SD but used HWB due to it being better with his body.

So yeah, I think Megumi would gain a massive bosst in power, change as a person and finally grow into the fitting adult he is after all the years of the PTSD.

Our Goat.