I just noticed their friendship is based on their traumas. Bojack had an horrible mother that never loved him And princess carolyn never been able to have a child. Princess carolyn always took Care of bojack in a somehow motherly way.
I kinda think bojack Sees her as a mother figure idk ?
Bojack needs a mommy and PC needs someone to take care of so they’re perfect for each other in the worst codependent way.