Leon is one of the researchers and developers working for Santa in the UNITY Toymaker Division.

When Cate Archer was going through some training in Basic Field Tactics, she needed to talk with Leon in order to proceed to the next level of training.

While in Morocco, Archer found a Briefcase containing piece 89g-7 of the CT-180 Utility Launcher and a note from Santa to Leon regarding his upcoming dinner with his wife and mother-in-law. Santa was recommending the Maison Du Runnels Zinfandel Wine.

Later, in an Advanced Field Tactics course, Archer was instructed to use Sleeping Gas on Leon who had been awake for 32 hours working on the Briefcase Rocket Launcher prototype.

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