ant warrior should be both war and nature schools, could have some digger ants that are earth and nature, flying ants air and nature, mix up all their schools so no one mage gets them all, except for AntMage/Gi-AntMage, who can change size and isn 't trained in a primary school like the siren. Antmage could be Earth mage also trained in Ants and ???Terrain??? .
Or trained in level 2 Earth/War/Nature, with all ant spells being a combination of those schools.
I just don't think nature needs any more creature subtypes, splitting up the ants among differant schools seems cool. FIRE ANTS!!!!!!Dark/nature for poision ants that eat and recycle dead ants
Giant Ants, ant scouts, larva conjurations. This could totally work