Regarding the movie, I just had the mental picture of Luigi in your AU using the mini shroom on Bowser so he can get to carry his kooky Koopa boyfriend around for once XD
Huh. This might end up being Luigi's pet turtle instead of Peach's.
Now I just have the mental picture of Luigi taking Bowser out of the castle to sort of 'rehabilitate' him (aka: teach him how to be somewhat normal, lmao!), and he just sits on Luigi's shoulder and hisses like a snapping turtle at anyone who gets too close.
After this Tim will decide that he has been awake for far too long and promptly go to bed. Only to realize that the spooky white-haired child was not a sleep deprivation hallucination when he awoke to said white-haired child staring down with teeth a bit too sharp and eyes a bit to green to be human.
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Tim: Wakes up
Danny: Rawr
Jason: That’s adorable, now stab him and you’ll be perfect.