Ooooh, this is a good question. Because not all of the trolls interacted with the kids.

So Dave and Tavros - yeah they have nothing. I see no troll romance with them.

Tavros and Rose - same as before. Nothing. Maybe I just don’t see Tavros being in a relationship yet? Or at least anyone but Vriska (I am low key rooting HEARTS for them later on)

Karkat and John - …I can see them as friends. Maybe diamonds? Karkat’s negativity is balanced out by John’s positivity

Karkat and Jade - maybe spades, though it hasn’t gone into respect yet, just trash hating.

Kanaya and Rose - yeah this has to be Hearts. They are too much alike to be Diamonds, and they don’t have enough hate in them. or maybe spades because they do have a rivalry? I’m still thinking hearts later on.

Kanaya and Dave - yeah nothing. No romance, just open and supportive

Terezi and John - if they were, I would say Hearts, but I am not really feeling it. They don’t match as well to me.

Terezi and Dave - I do like her relationship with Dave, (and future dave), I think if they were a relationship if could go as Diamonds or Hearts. But I am not sure if I see it yet. There is potential for it, but not at the moment

I think that is all of the troll/kid combos I could think of