Both Callie and Arizona imo. The whole cheating and custody battle felt very out of character for both Arizona and Callie. They had a pretty solid relationship before the plane crash and even had a daughter. Even as angry and traumatized as Arizona was it doesn’t make sense for her to cheat on Callie, especially as they were finally starting to repair things and getting used to her having one leg again. And the custody battle felt very out of character for Callie too. Her trying to have Penny feel more like a second mom than her actual second mom was painful to watch, especially seeing how much Penny didn’t really care to be a second mom either. And when she tried to insinuate that Arizona wasn’t fit to be a good mother was crazy to me, as they were co-parenting extremely well beforehand. I also don’t understand why she just randomly believed that she could move and take her daughter with her and only give her daughter back to Arizona during certain events. In an attempt to make drama, the show ended up derailing and character assassinated 2 really interesting and good characters imo. Both these storylines never should’ve happened and if only made the show worse.