A child prodigy and Whispered like his younger twin sister, Teletha, he is known as "Mr. Silver" in the executive circle of the Amalgam organization. However, Leonard surpasses his sister in both knowledge and physical prowess, even defeating the ARX-7 Arbalest piloted by Sousuke. He also claims to be in love with Kaname Chidori. In the anime version, Full Metal Panic! The Second Raid, he earns her contempt by forcefully kissing her. In The Second Raid, he is chaperoned by two miniature ASs. It is speculated that the whispered knowledge inside of him has allowed the creation of the Codarl and Codarl-m (Mithril codename Venom) type AS types (as Bunny Murata was to the Arbalest), the miniature Alastor types and the Leviathan-type underwater fighter/AS hybrids. In the novel, Continuing On My