Based off of timebenderss gif set
I know Jack has that whole ice thing going on, but when I was trying to get that to work his movements and personality seemed more like an airbenders (You can’t fight firebenders with -fun-) Plus the cloak and staff transfer over well as the airbender outfit and glider (I might also have bias with air types u_u) If you want to get really dark he can also be super lonely and the last of his kinda ahahah. ha. ha.
Plus I really liked the idea of Rapunzel being an incredibly powerful healer and can waterbend her hair like a whip. Maybe she saved Jack from near death and that’s why his hair is also white?
Hiccup I see as coming from a town or family full of buff earthbenders and he’s either really bad at it or the first nonbender in the fam.
And Merida would be from a family of Mai’s status but she runs off to practice with the YuYan archers. Maybe it’s a family tradition to dye their hair red with something like henna.
(Also let’s not do the fighting over houses thing with this, mad respect to other people’s Nations headcanon, though feel free to let me know what you think!)