One example, one that I really think would be cool, is the StasiBlii, which is a Blii that deals Stasis damage.
He has 4 abilities. One is a melee single target attack. One is a teleport that has to be targeted next to an enemy and deals damage to all enemies in 1 range of the cell teleported to. The third is a 1 to 2 range linear ability that pulls them towards the StasiBlii. The fourth is a passive that causes all enemies to have reduced resists up to a certain amount each time they are hit.
All of the different Earth summons would have a different element of damage and 3 actives and a passive and would gain AP/MP at certain levels, etc.
Interesting idea, but how will it work with earth dragon Osa's?