Velliona
Some boring guy with boring lifestyle who likes reading fanficz
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yes it is and it has a lot of potential like making it as system mission in early stage, just don't make mc so op(like chakra, haki, or magic etc) only use them for emergency, make the mc use martial arts such as demon slayer breathing techniques or something just to make him look cool and get the girls
And to make it interesting add some world traveling system or something
fanfic about the heroine hearing MC's inner voice or something similar
I think the first time Luffy used haki is when his fighting against Sanji look alike, I remember that when that guy riding his big bull trying ram Luffy then Luffy just glare at it then it stop while sweating alot