What will happen? Will they turn brown & be mushy? Would you peel & then slice them?
I can never use the whole bunch (it's very hard to find a small bunch).
They are fine if you use them frozen for baking or smoothies, but they are too mushy for other uses once defrosted.
I peel and slice them, then put into small Tupperware containers. I use them straight from the freezer in smoothies---frozen bananas give any flavor smoothie a wonderful, creamy texture.
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Bananas frozen in their peels turn black and ugly, but their flesh smooths out and gets creamy. When I make banana ice cream, I always freeze the bananas first, then thaw them, buzz in a blender, and add to the ice cream.
To get a small bunch, break a few off the larger bunch.