Spoliers obviously, in case you are one of those people who never watch but say you want to and only find reasons not to watch while desiring to remain spoiler free.
A nice detail picked up on Tywin from r/asoiaf, during the purple wedding as everyone is focused on Joffrey, Tywin rushes to Tommen and shields his eyes and turns his Tommen’s head so he doesn’t see his brother die rather horribly.
Interesting character choice for Tywin by the show and Charles Dance, it really shows how much Tywin cares for his grandchildren. Which might seem out of character for Tywin but it really isn’t, it shows his that he is all about the family. All his machinations and motives are for his family and legacy.