I really wanted to like her, but Vivian is not a very good champion to me.
She's kind of like female version of Viktor. She has a basic machine gun though she doesn't seem to be as powerful.
I'd always seem to be losing more lives than inflicting some KOs.
She has a deflector shield which is semi-useful but her superpower is to summon some robots to help her which I didn't find very powerful or helpful at all. She's not the worst champion but she won't really be in my roster.