Mario - Leveling Up - APL

Description: I made this thing because I thought 'What if video game characters had an RPG style of leveling up?'. Yes, those exact words. I thought that it would start from level 1 (not a stage or anything like that) and would slowly progress to higher ones with XP or something else, as well as the character's abilities and costume[s] (I'm assuming you would be able to change them yourself).