Add laundry room on the main level. Take space from the oversized master bathroom. Make Bed a second living room. Two bathrooms upstairs converted to one, better laid out bathroom. Eliminate the ground floor rooms (possible future).
Definitely want to make some capes from adult tee shirts. If cut the neck and add velcro for safety though. No-Sew Superhero Cape from a t-shirt. The post has a tutorial for toilet roll superhero cuffs too.