One Piece: A New Era Begins with Marrying Shirahoshi

[No joining Luffy's crew] + [Multiple heroines] + [Snatching opportunities meant for others] + [Making Momonosuke wish he were dead] + [Original plot] + [The protagonist does not eat a Devil Fruit]

Li Ang is a half-fishman of unknown origins who suddenly obtains a Fame System. The greater his fame, the stronger he becomes.

And with this System, he sets out on a path to invincibility.

On Punk Hazard, he steals Momonosuke's opportunity, obtains an Artificial Azure Dragon Fruit, and captures Monet.

Then, using Monet as bait, he draws Doflamingo in, defeats him, and becomes the new emperor of the underworld.

He even joins forces with the Revolutionary Army to attack Mary Geoise and overthrow the Celestial Dragons' rule.

“But the most important thing right now is to get Shirahoshi first!”