Despite their father's disappearance as a child, Leo's life is described as pleasant and peaceful. Leo is described as 'cute' and 'charming' on the surface, but dangerous on the inside. Leo went on to enter the King of Iron Fist Tournament 7 with the intention of learning more about their mother’s work at the Mishima Zaibatsu. Leo was unaware that their mother had worked for the Zaibatsu and was surprised by the information. At some point, Leo was able to infiltrate a train and discover a computer file detailing work Emma Kliesen had conducted for the Mishima Zaibatsu. Leo began delving further into their mother’s past. Despite this, Leo was unable to confront Kazuya at the tournament. Leo discovered that Kazuya would be appearing at the King of Iron Fist Tournament 6, and attended the tournament with the intention of taking revenge against him. 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. Some time later, Leo’s mother was killed by an unknown assailant. 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 a father who was a world-famous spelunker and a mother who was a G Corporation executive.

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