@Bornlucky Yeah, a scout would be fine. Also, I think that if Agate can earthbend, it shouldn't be really strong like Lapis's waterbending, as waterbending is Lapis's weapon, and Agate has his maze.
I was also thinking that Melanite could also have a spin attack like Amethyst and Jasper. However, instead of it spinning verticly, he could spin horizontally like a tornado, or a beyblade. LET IT RIP!