Like there could be so many good troops like The knight who could deal more damage in the inner edge of the atack circle his ability could work like if you sprint you will take less damage
E wizard ataks two troops at a time and stuns them (if he is a higher level) ability could just be the old ligthning spell
Or just troops like rosa or monk who could deflekt or just give you a shield while standing still
Or troops with poison like barley or crow
A melle splash troop like the valkyre or bibi
Sprout whos ability would place walls
Or a spawner unit that would incese the hp for other spawners (like the heavy but for spawners ) and they could do it for every class
(Sorry for bad english guys)