I'll explain since you say you aren't gonna bother reading either Bleach or Naruto.
A bumbass main-character has a demon/demonlike entity in him. He occasionally relies on its power to gain a power boost. At a certain point in his life, he realizes or rather made realize that he's too weak to protect those important to him. So he uses a special training method which enables him to fight the entity lurking in him to gain control over its power and starts using it as his own ultimately becoming far stronger.
By this point, you're probably thinking I am describing Asta
but I am talking about Naruto/Ichigo. Yeah, they're strikingly similar to Asta in this regard which is why you're seeing the names Naruto/Ichigo everywhere. Wait, Did I say a weirdo with the same or identical powers helped them train? and surely, I mustn't have forgotten to mention the fact that they train to fight off people with identical/similar powers, Did I?
Not to say you should read em but Naruto and Bleach aren't as bad as the rumors say. Naruto was more popular than even OP during its days of glory. Bleach, on the other hand, remained one of the big 3 along with Naruto and OP for a long time even during its days of demise. They both went downhill at one point or the other just like OP rn but they're not so bad that you shouldn't consider giving them a try. Contemporary readers may appreciate them better considering they don't have to wait for chapters with anticipation and go through the agony of getting their expectations shattered.