Naruto System in One Piece - Chapter 120

A world where awakened individuals with special powers emerge due to a system. At the New Spring Kindergarten infant class, Gru awakens as an S-rank Hunter at the age of 4. Along with this, there is a quest assigned to her… [Quest: A child needs a strong guardian!] Why is a guardian needed? That is because Gru has no mother or father. Gru, who had no family, is adopted by the greatest Hunter in South Korea after many twists and turns, and along with that, new skills are developed… [Let’s try registering a new guardian in the slot!] [Children can earn ‘filial piety points’ through various activities, which can be used in different areas.] Gathering guardians enables faster growth? ‘That’s amazing!’ Alright, I’ll gather all the S-rank guardians!

After transmigrating through ten years and silently registering his name at the Shanmen for ten years, the system finally issued Ye Changge his first task: to take in some disciples!

In this period where countless supporting lead actors always attempt to counterattack, turn over a new leaf or simply refuse to take up the role, his purpose of existing is to fill the role of a good supporting male lead and uphold his duty to the best of his ability. To add the needed lustre to storylines and this world. Only, it’s a pity that someone who is not afraid of god-like enemies will be afraid of pig-like teammates.

Bitterly, he realises that for some unfathomable reason, he is being bothered time and again by a bastard who refuses to follow the script… In order to walk the path of a good supporting male lead, he engages in a battle of wits and courage with that person. Loving each other and killing each other, one ultimately cannot escape fate’s teasing– why is it so difficult wanting to be a responsible and diligent supporting male lead?! QAQ

- Description from novelupdates

In 2077, the gods sent potential successors across the cosmos to Earth for the God Trial. The result: the apocalypse and the rise of history’s most unlikely Harem God candidate.

Leon Traxler was a sociopath that faked his emotions and had a phobia of using women for sexual desires. Yet he chose the power to build an overpowered harem because finding strong, loyal companions during the apocalypse was unlikely.

It was a calculated decision, but he got something he hadn’t bargained for.

Emotions.

With a power that leveled him up through emotional milestones and a system that made him feel them for members, he quickly amassed power and decided that the apocalypse was a blast.

Driven by a desire to make his violent yanderes happy, a love for animal ears on women, and a narcissistic wet dream to be the only man on earth, he decided to partake in the God Trial.

His strategy? To raise an army of women, build a city for his harem, and start a cultured civilization that would naturally end when he died.

Join Leon as he becomes a celebrity on god social media, rises to power on earth, and lives life as a playboy in the apocalypse.