Transported Into A Manga/Webtoon?

Hello, this is a totally harmless question about..

What would you do if you can be transported into a Manga/Webtoon?
Let me tell you guys more, hahah!

I've been thinking about 2 options that could happen if I, or someone else, were to be transported into a Manga/Webtoon of our choice.

You can enter the manga/webtoon, possibly change your appearance, and interfere with the original story that you have chosen.
OR
Take the original Protagonist appearance, and change everything in the story by acting with your own personality, the only difference is that you're actually the Protagonist!

This is just something I came up with, because everyone has a Manga/Webtoon they wished could go their wayヾ(❀╹◡╹)ﾉ~