Gustey Crood is the main character and well-meaning, overprotective but outdated patriarch of the Croods family. Gustey keeps his family in line and believes strongly that things should really never change since they lost their neighbors from not being careful. As Eep says "Our family has lived their whole life living by my dad's one rule; never leave the cave". It is likely he got this from his father and possibly Gran because when the earthquake happens it is confirmed that Grug is forced to break tradition to save Guy, Eep, Sandy, and Ugga.
Grug has dark brown hair along with a scruffy beginning of a beard. He has hazel eyes and has very big teeth. He wears a brown fur of possibly a bear and is heavily built.
- " Cavemen don't need brains, we have these ( shows off his boxing stance and throws a few punches ). Yeah! That's what I'm talking about! Ideas are for weaklings." To Thunk and Guy.
- " Tonight, we'll hear the story of Crispy Bear. A long time ago, this bear was alive because she listened to her father, so she was happy, but Crispy had one terrible problem. She was filled with....curiosity! Yes! and one day she saw something new, and died!." To Thunk, Ugga, Sandy, and Gran.
- " I also thought it would kill your mother" To Ugga.