You can, it's actually quite simple, even through maybe a bit time consuming.Can you actually do that? Tbh I like how the MC currently talks but would be very interested to have a more....pleasant talk from the MC especially when it comes to Otaku lol
There's no real "programming" to do in renpy, actually, if you "only" want to change line of text or image, it's actually really easy (If the game is correctly "protected", you would have to use a tool to get the files the text and images).I looked up guides on the Ren'Py subreddit and official site. The former mentioned something about decompiling the game first using Python.
I've never had any prior programming experience which is currently the biggest barrier I have in embarking on the project.
Edit: That and my tendency to abandon any long-term passion project. Life comes at me fast.
But I don't think it's good manner to reupload someone else work that you modified, at the very least I don't know how it's viewed by the community, but I would assume badly unless you speak about it with the dev ^^