He must be the reincarnation of the legendary Fatty who once fought side by side with the benevolent and generous Meng Hao, who is in no way bashful.
So from time to time he indulges in gluttony and hr becomes fat And the loses it from something happing
The fatties brotherhood have such a hard life. Eldest fatty master had him starve because she hate fatties. Third fatty brother was also starve. Discrimination I tell ya.
nah, he gets real skinny. It is even stated that he is quite small and slight, which make his battle attire look all the more ridicuous as he swaggers into battle like a shameless mofo, trolling everything in sight. Never seen such amounts of trolling in the early stages of any novel ever. just finished binging all translated chapter and, dear gods, my face is still hurting for laughing so hard. He reminds me a bit of silly bird with his behavior. Give it a read, really, you won't regret it.
He eventually start´s the Fang clan and Meng Hao is for sure one of his descendants. Oh, he also tricks a turtle to become a dao protector
Little Fatso will shed his weight like a turtle breaking through its egg. Though he will wish to go back, his profound skills and abilities will not allow him to. Aiyah, such is the curse of our Little Turtle, our lonesome expert...
In short, early he is fat then he is a bit more skinny like and handsome (well a bit like cover) then again there are some changes and so ya know. But that guy is really a trickster boy.