After transmigrating into Naruto, Kagura Arashi awakens a Trait System that lets him copy the abilities of anyone powerful enough to touch.
Uchiha Sharingan? Copied! Sage Mode? Copied!
He thought it was just a ninja cheat, until the System announced: [Interworld travel energy is full. Next stop: Demon Slayer]
From then on, he hunts down traits across countless worlds: Soul Reaper Zanpakuto, Demon Slayer Breathing Styles, One-Punch Man superpowers...
“I’m either getting stronger or on my way to getting stronger.”
The entries are in a mess, sometimes they are blue or 10, sometimes they are green, and I don't know where the article was posted.
A plug-in, a mess and some settings that limit the growth of the protagonist!