Chaze - is NOT p2w, and as of April/May is an easy to beat combo.
GK - can be unlocked only through HAAT, so him being powerful is justified.
R2 - he is as bad as the previous 2, you decide whether this is a bad or a good thing.
Thrawn - His dmg is semi-decent, compared to actual attackers he is nothing.
DN - the true most OP, unbalanced toon. He is in every single team, no matter what you run. The current meta teams consisting of Empire toons mostly, also use him.
So if you just read my comment you should notice a similar pattern between my reply and your post. The pattern is that I absolutely skipped on talking about Chaze, I just mentioned them, so people would see that they are in the "most op" list, and I threw all my hate on DN. If you look closely at your post, you will notice that you did the same but in reverse.
So you see OP my point is you obviously cry that you cannot beat Chaze and you just mention a few other op characters in there, thinking that something will happen. How do I know that? Simply. I did the same.
I cried about DN(which is the actual toon that you can find in every single team and is the actual toon that needs a re-work)and just mentioned the other heroes so I don't have people coming and telling me "ugh why didn't you include this toon and that toon, they are OP too).