Profile

luminoso78

How do you change the character you have on your profile ?

Superman69

On forums or In-game ?

In forums, (if on a computer) you'll see a 'gear' icon on the top right-hand side of the screen, press it and click 'Change preferences' then there will be a menu on right side, click change picture and you'll see a number of champs to select from.
Not sure about how they are on phones though.

In-game, just rank them up to highest rank/level and pray they have the highest prestige.