Who to level up to 5* next

[blkthunder]

My vote would be for the Assassin Golden Son... he's my next 5*.

I have one 5* with all his talis on 4* and its quite good even i think that he can suffer the nerf hammer in the future, mine golden son hits around 2000-4000 if the crit enables but with the last update and my secret talismans on him xD sometimes do around 14000 or more in a turn