I'm just imagining at somepoint in the vaugly planned for "chunin exam" arc there's a team from Iwa consisting of two people with the Lava relase kekkei Genkai, one of whom exclusively uses ash techniques and one of whom exclusively uses lime techniques with the third teammate being a descendent of a previous Four-Tails Jinshuriki who uses actual lava, meanwhile, there's a team from Kumo consisting of someone who uses rubber lava techniques someone whose family defected from Mist to Cloud and they have Mei's Lava/Corrosion release and a subplot is preventing an international incident becuase the two teams keep butting heads.

(meanwhile, Senko is drooling at the research opportunities/s)