Grades and other stuff.( spoiler)

So a lot of you are asking about grades and stuff so it's like this-

If he got Sharingan--> 1tomoe(B), 2tomoe(A), 3tomoe(s)

So if he got Sharingan 10 times then he will have Sharingan which he received more times like he got 5--2tomoe Sharingan and rest others than he will get 2tomoe permanent Sharingan and he can evolve it further by training and other stuff.

Grades are just for showing the power level of ability.

Powers and items other than one that is consumable or what can remain or be absorbed will remain after 24hrs. But rest ability and item will disappear.

Like he got a Kryptonian physique so it disappeared after 24 hrs but the sunlight his muscles absorbed remained to make him stronger but not to the level of superman.

And regarding mc's personality or behavior, some said it's shaky well he is human what do you want? He can't remain serious or cruel his whole life he is human so he can't possibly be constant his whole life. And most likely mc is not caring and doing what he wants but with precautions type.