Jannnah
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You could give him the powers that Kingpin gave him in the comics (unlucky), if you decide for this you would have to wait at least 2 to 3 years in the future, assuming that shield or iron man takes note of spiderman a connection could be created with dr. Strange to take away Peter's bad luck, this would have a side effect on Felicia making her lose her bad luck ability and gain physical increases (strength, agility, resistance, night vision, etc.),I think this is better than just giving him the super soldier serum. I'm sorry if it's not understood since I don't speak English and I use the translator.
Realistically, it should be impossible to unlock even half of Garou's powers. Keep in mind that Garou reached that level while fighting with Saitama and in the world of Naruto it should be impossible to meet someone that strong and you can't reach that level with training alone.
"Unlike on Terra, where a single day lasted 24 hours, inside the Tower of God, time flowed three times as fast." "Spending an entire Terran day inside the Tower of God is the equivalent of losing over a week of your life!" I think this part is wrong, it says that time passes 3 times faster inside the Tower of God compared to Terra, so it should be 3 days and not 7 (or the time inside is 7 times faster than on Terra, so it would be 7 days inside are 1 outside), I hope it is well explained
(After running the chakra in his path for a few more cycles, Haru stopped) Is this going to be a cultivation novel? Because it feels strange to read that the protagonist's chakra circulates when in the naruto anime they never do those things, the chakra increases with physical training, experience and knowledge as the years go by.