Leonidas is known for his ability to charge into people, scream "THIS IS SPARTAAAAAA!!!", run them through with a sword, punch them in the face, throw them across the planet, run them through with a sword a second time, make them swallow a bomb, and then kick whatever's left of them into a hole.
Leonidas is an awesome guy, who owns Sparta and The 300. He was born in Sparta, he was raised in Sparta, he fought for Sparta, and now Sparta fights for him. He loves screaming "THIS IS SPARTAAAAAA!!!" and kicking people (like the Persians or Google employees), into giant holes.
Harsh, but sometimes necessary (well, not really).