I voted Avatar the Last Airbender. The team as benders would be aawwweessoommeee
Tuuri: Airbender
Lalli: Waterbender
Sigrun: Nonbender
Mikkel:Earthbender
Emil:Nonbender
Reynir:Firebender
The way I see it is more like:
Tuuri and Lalli are waterbenders, or at least, from the water tribe. Tempted to make Tuuri a non-bender, a la Sokka. She makes up for it with her technical proficiency.
Sigrun: Firebender - personality.
Emil: Firebender - personal affinity.
Mikkel: Earthbender. Again, personality.
Reynir: Airbender - Desire for freedom. Though, on that basis, this can also be an argument for Tuuri as an airbender.
It has been a 100 years. Tuuri and Lalli find Reynir, the avatar, stuck in a crate. The Fire Nation of Norway/Sweden has been kicking a lot of ass on the basis of being vikings with flamethrowers. Iceland, land of the airbenders, has been burninated. Finland is Finland. Too much forest and lakes to properly burninate. Danemark? Burninated, aside from the super stronghold of Ba Sing Se, I mean, Bornholm. Emil, a young impetuous firebender with the intent of making a name for himself sets out to hunt the avatar under the command of Sigrun, one of the best Fire Nation commanders who takes him under her wing. Along the way, Mikkel, also known as THE BOULDER, joins the avatar group and they have adventures, mostly running away from the Fire Nation and bringing back balance to the world. Also the spirits are going amok and people are turning into monsters because of that. The Fire Nation's answer is to burn things. No points for originality, but the avatar will have to learn how to do the spirit thing, led only by Lalli and his sad-faced mentor Onni. Prospect of success: low. The Fire Nation just kicks too much ass.