Zero is the most balanced tower in the game that suited for anti tank anti runner or anti boss even without moneys producing tower
its original name is Zero Two From Anime called Darling In The Franxx
This tower is sometimes nerfed but considered as best because firing speed and damage her cause
Her is Avaiable until highest prestige/level
Her damages is pretty good and compared to superman it can surpass it
Advantages: Boss killing, Anti small enemies cheap anti tank suitable and Balanced.
Cons: If you not use it wisely its not effective