Wait that niece stuff, where did you read?
It was on the web novel, a lot of people on reddit talk about it too like this one
(Comments) (and lot more if you search Mushoko Tensei Neice)
https://amp.reddit.com/r/mushokutensei/comments/lfu9kg/an_article_i_came_upon_today_would_like_to_know/
and this too, they just changed the niece to mosaic less l0li
https://www.wuxia.blog/novel/Mushoku-Tensei/23268/Volume-1-Prologue.html
Yuck I can't believe I read the manga up to date yuckkkkk omg I never liked the mc and the fact that he was commenting on people was even disgusting but I never understood how others liked him when they are 100 times better than him. I mean few people literally died because of his immaturity and he hardly repented for like 2 seconds and again thought of himself yuckkkkk
Drop it shoo shoo
Read if you like shitty pedophilic mc and a big pervert too, was watching the anime but dropped when I learned mc skipped a funeral to fap to a video of his niece taking a bath recorded by a hidden camera in the bathroom
Mc should've never reincarnated, and should have just died and turned to nothing by the vehicle
(Youre a shame if you like or defend the mc's action)
(Im not shaming you :) the mc is just shitty)