Hello

Which champions have u done all stars in campaign ?

I finish Brutal 3* back then with Doompriest and Skullcrown, didn't finish all NM yet. 

Brutal - Bad el kazar and Relickeeper

NM Big -UN + Lilitu or Bad el (the first 4 maces)

For nightmare, I cant remember specific champions that I used to 3 star regular stages. But I believe, I mostly choose Apothecary and Tormin. Some of the stages I use Tayrel. On the last stage of Nightmare campaign, I use Paragon (171 spd with 200 res) as a tank with Tormin.