Idk when devs could add this but imo it would be cool
Secret unit that can be obtained by fusing V Banner mythic and Urizen(New Boss) together(i will explain how he will work in a moment)
Dante Banner mythic that can be evolved into Dante(Sin Devil Trigger) he can be like Jack of all the trades has an ability to switch between 4 modes using his ability(will explain in a moment)
Nero(Armless) Banner mythic that evolves into Nero(Devil Trigger) in lobby you can craft his arms for event materials like each one will have it's own mechanic.
Will link each unit suggestion below