Leo made attempts to meet with Kazuya, but his position as leader of G Corporation made it difficult to get an audience with him. Leo began to look into the case alone, and identified Kazuya Mishima as the most likely suspect. Leo was grief-sticken by the murder, but sadness turned to anger when the police ceased their investigation without explanation. Their mother, Emma, was killed by an unknown assailant. Tragedy struck again though when Leo was around 19 years old. Leo grew to have a strong sense of justice and became an accomplished martial artist, learning the art of Baji Quan, and also a spelunker as they always dreamed. Īfter their father's disappearance, Leo was raised by their mother, and had a pleasant and uneventful childhood. As well as passing a passion for caving on to Leo, Niklas also taught Leo some fighting.
Leo’s father disappeared on an expedition when Leo was still a child, but this did not deter Leo from wishing to become a spelunker as well.
Leo was born to Niklas Kliesen, a world-famous spelunker and archaeologist, and Emma Kliesen, a geneticist who worked first for the Mishima Zaibatsu, and then for G Corporation as a researcher and an executive.
