Jake Simmonds

Jake Simmonds was a young member of the resistance group called the Preachers, which opposed John Lumic's Cybermen on a parallel Earth.

Biography
Jake worked alongside Ricky Smith and Mrs Moore, among others. Shortly before Jake met Mickey Smith (Ricky's counterpart in the main universe), the original leader of the Preachers was captured. Jake had a close relationship with Ricky. (DW: Rise of the Cybermen)

During the Cybermen attack on Torchwood Tower, Jake, Pete, Mickey and other soldiers came from the Parallel Earth and killed numerous Cybermen. When the Tenth Doctor sealed the breach between Parallel Earth and Earth, all the Parallel Earth soldiers that survived the attack returned to their own world, including Jake. (DW: Doomsday)

(The Tenth Doctor also called this boy Jakey Boy.)

Behind the scenes

 * In a deleted scene, Jake implies that he and Ricky were lovers, to which Mickey replies "I'm definitely not replacing him then!"