The fact that he can maintain this speed while being bigger and heavier is itself an evolution to how strong he is at the moment.
Thanks for the review, for the world building it is coming as for the moment there is only 27 chapter. Otherwise, you are right about the protagonist, he isn't at all a human being.
Protagonist will do some things but he will only rely on himself. Because it's martial arts (wuxia) and not xianxia there isn't any type of technique that could soul control or anything like that. At the end, you can trust nobody apart form yourself.
At the moment, he his at 6.7m
He will soon encounter martial artists and I will not spoil more.
Soon.
Because, the protagonist don't any empathy, he like anybody don't like to be attacked or threaten, but in difference to most people, he doesn't care about what others feels.
"Ah... What…? I-" Her words suddenly ceased as a large hand squeezed her neck, pulling her into the darkness.
Fantasy · Aions
Don't worry. They will be no romance/affection/harem/companion throughout the journey, only killing and consuming.
If you want to try rationalizing the impossible then yes.
Li Feng licked his bloody lips, turned around, and knocked on the other door.
The Giant Who Travels Through the Martial Arts World
Fantasy · Aions