For example, in Victoria, Mariana was a young snot-nose repulsive, rebellious teenager, with a sassy, nasty theme song to boot. But I enjoyed disliking her. When she became a good girl, she was no longer interesting.
In La Casa de al Lado, Andrea was similar, a very repugnant teen girl. But after she stopped being evil, she was no longer interesting! But Miguel Varoni never let us down; he was bad to the bone to the end, dancing his little Hitler jig to celebrate successful villainy, etc.
I watched Litzy in Pecadora where her papel was for my taste boring. The bad-girl, Marjorie de Sousa, had the only interesting plot line in the story (IMHO). Paulo Quevedo was her henchman in that one, carrying around a dead body (Karina Mora = actriz now playing Yaya) inside a rolled up rug! It was for me funny.
But in Amarte Asi (now on Telemundo's .2 subchannel ExitoS TV), Litzy's papel was very interesting. She was the protagonist and cycling in & out of snits vs. Mauricio Ochmann, while Ochmann didn't understand what was going on. But the AA villains were also entertaining.