I don't strongly ship any of the characters on this list with anyone else on this list. Sokka and Suki I guess.

Aang and Katara because they are so cuteeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee (i think i am obsessed)

Also

Sokka and suki

And kinda sokka and toph

Toph and sokka{LOK)

Aang and katara(ATLA)

Zuko+ katara (atla)

Toph+ sokka (lok)

ATLA:

Aang (Atla) X Katara (Atla)

Zuko (Atla) X Suki (Atla); Didn't really have a choice, but it seems good

TLOK:

Sokka (Lok) X Toph (Lok)

Tenzin (Lok) X Lin (Lok); Honestly seems Toxic, but they're the only ones who match

Korra (Lok) X Iroh II (Lok); He's much older than her so it would be weird, but I didn't really have much of a choice

Normally this sorta stuff never ends well

Sukka(ATLA)

Kainora(TLOK)

Aang and Korra

Idk?

Toph and Katara since I am non exist