Nothing is known about Pablito's life before the apocalypse.
Pablito is first seen with Everardo cleaning a drainage pipe when they find Daniel Salazar among the debris. Worried about being caught with Daniel as they think Dante's men will believe they are scheming to steal water, they alert Lola. Later, Pablito is in the cafeteria with Everardo, Daniel, and the others eating lunch. The next day, Pablito is taken into custody and framed as a thief stealing water, despite being innocent. He begs for his life and pleads his innocence to Dante Esquivel. Just as he believes his life will be spared, he is thrown over the dam's edge to his death.
In order to send a message to those who "steal" water from the dam, Dante throws Pablito off the dam to his death.