Katekyo Hitman Reborn
It's funny, but I think the first 60 chapters are filler chapter filled with random jokes and stuff. So you could honestly get away with reading the first ten-fifteen chapters and skipping to chapter 60-65 for the action.
I like it because the characters are memes at this point. Like, one guy called Hibari Kyoya says, "I'll bite you to death" almost perpetually. There's an anime for it too.
But it might have a rather generic plot, but considering it's age, I don't think it was that generic back then.
If you do read it... uh, you'll get to a part called the future arc, if you go further (Simon arc... so on), the power dynamic gets screwed up so some people really dislike it. Personally, I just read them as separate stories tbh. The ending is also abrupt and some people argue there's no character development because of the end, but I disagree.
But as you go further on the art gets really good- so um action~ ヾ(❀╹◡╹)ノ~

give me the best action piece you’ve ever read and one that isn’t boring