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I agree with the statement that all of the characters are pretty much versatile. If I had to give a list left to right from "prefers bottom" to "prefers top", I'd probably arrange it like this after having played through each route as they are so far: 

Dwayne, Spencer, Harold, Chester, Darius, Richard/Dozer

This list doesn't really seem accurate, though, as none of the characters are strictly one or the other and land more in the middle:

• Chester says he would prefer to top but isn't quite sure. His reasoning seems to be based more in functionality than pleasure, though.
• Darius states that he doesn't bottom although this seems to be more rooted in him being too stubborn to admit he likes it (if his bottom scenes are anything to go by).
• Dozer doesn't state his position preference IIRC but does seem to like being in control... however, he also states that he likes smaller people having their way with him.
• Dwayne says himself he prefers to bottom, but isn't opposed to topping, especially if it would please his partner.
• Harold, like Dozer, doesn't state his preference, but it's heavily implied that he really enjoys bottoming (mostly the last day & epilogue) alongside topping.
• Richard is the character I know the least about because I still need to catch up on his route, but from what I have played of his route, he seems to be up for anything. Some might see him more as a top, but I think he's just an assertive guy with a loud personality and a lot of experience.
• Spencer's route is the only one where player choices can determine whether he tops or bottoms the first time. Later on in his route, he admits to the MC that he sometimes fantasizes of being made into his bitch.

TL;DR: All of the characters seem pretty versatile and enjoy it either way lol