So after going through the comments i saw a few suggestions and some mentioned a few worlds that i know and don't. So in this result some of you will probably disagree and not like my decision, but don't worry as the first five worlds he'll visit won't be his last. The reason why i asked you to mention of a few worlds was because he is going there to become stronger and challenge the kaiju world at some point. Anyways here are the first five worlds;
1. Marvel (To learn how to obtain a human form and probably face slap a few entities.)
2. Percy Jackson (To kill a few titans and eat them, then beat the $*** out of a few gods as well.)
3. One piece (To increase his defense by learning haki.)
4. Monster hunter (To increase his level and category)
5. Monster verse (To fight godzilla, eat Ghidorah and a few other kaijus.)
Though these are the first five, i am still open to a few more worlds in the future. I apologize to those whose ideas were not mentioned, it is just that i don't know much about those worlds. However, i will do a close research in the future by reading or going online. Anyways, thank you for reading and make sure to support this novel.