One Piece: Sengoku’s Son Loves to Stir Up Trouble

(The synopsis isn't doing it justice, so just read the story.)

The protagonist, Jiang Mo, transmigrates from the modern world and becomes Sengoku's son. As he causes one uproar after another, he grows stronger. The story has a rather twisted sense of humor, so don't read it if that's not your thing. He is absolutely no saint, and he doesn't grovel to or suck up to anyone.

Sengoku roars: “You unfilial brat! I'll kill you!”

Red-Hair: “What? You want to know if I can still trim my nails with one arm? I'll bite them off. Just you wait!”

Senju Tobirama: “What do you mean you dyed my white hair green?”

Sarutobi Hiruzen: “What kind of monster are you? You actually stole the monkey's peaches!”

Expose Hiruzen's crimes. Torture Danzo and Hiruzen to death.