Years assume that Leo is 17 as of mid-to-late 2017, and born in 2000.
- 2007: Leo is placed with the Delacruz family in CA. 
- 2008: Leo is kidnapped by Rossum. 
- 2009: Leo is placed with the Lancaster family in IL. 
- 2010: Leo's foster family comes down ill. 
- 2011: Leo is placed with the Washington family in LA. Rossum unsuccessfully tries to kidnap him. 
- 2012: Leo is placed with the Dorsey family in PA. 
- Leo is placed with the Yamada-Kim family in Halcyon City. 
- Leo develops his First Generation (G1) modular technology, but cannot yet mass produce it.
- Leo is placed with the Conway family in Halcyon City. 
- Leo builds Pneuma at the Conway house. 
- Leo is introduced to Agent Waters by name, and the two have their first real conversation.
- Leo perfects his Second Generation (G2) modular tech, which allows androids that can pass for humans on close inspection.
- Leo builds SNOWMAN for AEGIS.
- Pneuma breaks up with Leo. 
- Leo receives limited access to the money recovered from Rossum. 
- Leo gets access to Site 5.
- Pneuma returns, and the pair establish a friendship. Leo resolves to become a vigilante. 
- Leo rebuilds Otto using G1 modular tech, Pneuma using G2, and constructs the Link Suit for himself.
- Leo joins the Menagerie.