This mod, to sum it up, replaces Madeline and any related story aspects (yes, including our favorite mirror demon Badeline)
with Mario, as he appears in Super Mario World... in the case you couldn't already tell.
Question 1
Q: These questions were literally never asked ever!
A: Thats the joke.
Question 2
Q: Whos Badeline?
A: Green Mario, of course. I just thought it'd be funny.