Koy and Bakugou: *hanging out in Bakugou's room* 

Koy: Hey...Katki? 

Bakugou: *eyes closed* Hm? 

Koy: Do you think we're best friends in other universes? 

Bakugou: I dunno, maybe. Perhaps I'm taller than you *grins* 

Koy: *chuckles* Yeah, right, you'd probably always be shorter than me 

Bakugou: *chuckles lightly* You never know 

Them in other universes: 

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For Cartman and Kyle, and Dan and Arin, I see Bakugou as Cartman and Arin, and Koy as Dan and Kyle 

And for the other two, I'll let you guys think fits them better