There could be like super cool ice enemy's and our screen can like fog up if we stand still for a long time because it would be super cold and we can have freeze guns with the same gun sound as icebreaker :D.
Edit: why does everyone hate Pluto
Edit: if this gets 500 replies I'll force Deej to make love with me and make Pluto
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With Pluto being the closest to the darkness, it would be cool to have a cold, scary, intense environment, one where you have to run and kill enemies to maintain warmth, where you have to watch your back, or be corrupted.