Just a random thought.

Why do I feel like the next ex character can have:-
1) multihit attack 2)a trait that inflict more damage to character having sheild. 3)might also have an broken status effect(both kuzan and Blackbeard have status effect)

Either way next ex can be really broken and if we get three ex then we will get his counter ex in literally 2-3 weeks( just like white beard).