Review Detail of Nirerin in In Harry Potter AU with a system (Myriad Realms Shop owner)

It's somewhat OK but the writer is either quite inexperienced or doesn't know how to write a mature character. The mc is quite stupid at times and the other characters like Harry, Ron, Neville and Hermione are very out of character. You have a system where if you change the plot you gain a very powerful currency and yet the mc sometimes acts stupid or doesn't realise something that is right in front of him, like how he has been at school with Hermione granger in the same year group for years but has no clue she is the Hermione granger even though he has been to her parents for his teeth and the excuse used is that he wasn't looking and that someone pronounced it wrong as Hermanie and he had no second thoughts about it...