Grimclaw is a tigrex and Saber's pet. He has blue and yellow skin, black stripes, and orange eyes.
While in the Monster Hunter universe, the team comes across a fighting arena created by hunters. They infiltrate the arena by putting their own rescued beasts into the fights. They all only pretend to fight each other to give the others time to rescue the trapped beasts. Saber rescues Grimclaw and he's grateful.
Grimclaw seems to occasionally be ill-tempered whenever his loved ones are threatened, and can be quite impatient at times. However, whenever Grimclaw is not working, he's a laid-back and fun loving Tigrex. He enjoys being scratched behind his neck and on his head.
He has massive claws he can use to tear up enemies or rip pieces of earth out of the ground. He also has a super roar.
Trivia:
Grimclaw gets his name from him being a grimclaw tigrex.
Saber describes Grimclaw as a t-rex with wings.