The Universal Villain[Old]

(This Fan-Fic has been rewritten. While still enjoyable to some this one has a lot of plot holes and other bullshit. So if you want a more complete version check out the rewrite.) Shen had obtained a strange system that gave him the chance to get 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 an average human. At the same time, Shen personally doesn't care what he has to do as long as he gets stronger abilities. This is a story about a boy who does not care about the damage he causes or the people around him. 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?