honestly I wouldn't even say jk is "evil", he just wants everyone's adoration. If you've seen the boys, the main supe, homelander, wants everyone to love him, he needs his fans and for people to look up to him. jk is quite similar, they were just raised like this, they were put in the spotlight right away and believe they're the greatest, strongest and best supe ever. they deserve everyone's attention.
to me, evil is more like they want to take over the world or something. as long as no one steps out of line, jk wont do anything bad. but if they have to get rid of some people or cause a catastrophe or he has to be bad to get what he wants, he will.
and all the members are like that. they've got their good and their bad. in the show, some of the supes in the 7 genuinely want to be heroes but they're blinded by all the acting they have to do and the money they're given. since I don't have an outline for this au I'm not sure where its gonna take us asdfghjkl but just be aware that all 6 of them aren't necessarily good!