Cisco comes from a rather poor Puerto Rican family and has a music prodigy older brother named Dante. His families attention was mostly on Dante despite that Cisco had shown an interest in mechanics at a young age, this new talent was deemed unimportant by his family and unrecognized. At some point he met what he considered the love of his life Melinda Tores, although nothing ever came of it. Melinda turns out actually liked Cisco but Dante lied and told her that Cisco wanted to become a priest.
Career at S.T.A.R. Labs
The first year that Cisco worked at S.T.A.R. Labs he was placed under Hartley Rathaway. The two immediately were at odds mainly because Hartley couldn't stand Cisco's clothing choices and that Dr. Wells put them on the same level. Hartley stated that Cisco wouldn't last more than a week at S.T.A.R Labs, but was proven wrong. After Hartley was fired Cisco was relieved that he wouldn't have to see him again and he became close to Dr. Wells, Caitlin Snow, and Ronnie Raymond.
Particle Accelerator Incident
The Particle Accelerator was turned on and it was a huge success for a few minutes, at least until everything went wrong and it malfunctioned. Cisco along with Ronnie went to shut off the accelerator in its core chamber. Ronnie told Cisco that if he wasn't back within two minutes then the accelerator had to be placed on lock down. He was forced to lock it down, with Ronnie on the other side and Caitlin joining them not long after. They were contacted by Ronnie who told them that he was going to send the explosion upwards rather then out, resulting in Cisco having to change the particle parameters to compensate. When the Accelerator exploded Ronnie was seemingly killed and the blast wave effect numerous people in Central City giving them abilities. Cisco was unknowingly also affected by the Accelerator.
Following the incident of Barry Allen getting hit by lighting he was transfered to S.T.A.R Labs where Cisco and Caitlin looked after the comatosed future hero. At this time Cisco and Caitlin had met Felicity Smoak when she came to vist Barry.
To be extended