The Universal Villain

Shen has been granted a strange system that gave him the chance to obtain abilities ranging across multiple fictional universes. The system only requires him to make it a better version of its former self by defeating or killing anyone or thing that is more powerful than a normal human while Shen personally doesn't care what he has to do as long as he gets stronger abilities.
A boy with a system who does not care about the damage caused to the people around him or the main storyline?
What kind of chaos is he going to cause ripping through universes for fun and with the sole goal of becoming stronger and what kind of impression will he make on the original characters involved?
 
Author's note:
I own none of the characters from these universes and do not own the picture used as the cover if the owner would like me to take it down please message me.