I wouldn't plan on a mini fridge on purpose. They have a lot of downsides (lack of space, not cold enough, takes a long time to chill something, lots of energy without much to gain from it, etc.).

If you've ever had the joy of a second full-size fridge/freezer, you never want to go back. And if you ever sell, you'll still want a spot for a full size to make sense.

Where is the fridge supposed to go in the kitchen? If that's going to be a bedroom and hangout room, you'll want way access to cold drinks down there.

Is your storage closet room wide enough to have big Costco storage tubs on each side and move freely down the center line? I first thought skinny and narrow was silly, but it's easy access to everything down there.

I'm 5th-ing it needs a shower down there.