How to measure characters' ability from a RPG?

[Mariogoods]

As we know, the characters especially main characters in RPG have the ability of leveling up. But for most RPG, the maximum level means the unreasonable power and it is sometimes hard to gain in normal game. Then, what standard can we comply with? The 999 ATK and 999 DEF? Or other feats by plots?

 

[Saikou_The_Lewd_King]

Stats shouldn't be used at all except for stuff like a character one-shotting another in a fight to showcase the difference in strength.

 

[ZacharyGrossman273]

Please don't use game mechanics. If the character is actually supposed to be able to beat a character he scales to them.