Leo was born in Part 24: Baby, and Aged Up in Part 27: BIRTHDAY BOY. Leo, once a Child, received a hipster-style makeover and applied to join The Avant Gardes group. Lifesimmer described him as a "nerd" and, awestruck by his cuteness, compared him to her beloved Drake Monette from The Sims 4 LP. Leo went on to instigate and lose a fight with Max Villareal, the leader of the infamous rival group: The Renegades. Lifesimmer pretended that Max had initiated the fight for storytelling purposes. Paolo was very supportive and advised Leo of how to win any future fights, whereas Valentina was less impressed.
- Leo is named after Leonardo DiCaprio