Ddddddu

Mc has a very long character development as one can see from tremendous amount of chapters but other characters have a bit better I think I mean they're not the mc. Everything that happens in the other world is just raw human nature that make us humans which was really ugly and disturbing. 
If you want the Mc to develop as a more decent human being you gotta give your time because it won't happen any time soon in early or mid chapters.