Maxwell Dillon (Earth-21399)

Early Life
Maxwell Dillon was born out of wedlock due to his father abandoning the family shortly before his birth. Raised with attachment issues due to his father's absence and his mother's overbearing care, Max was quite the socially awkward kid.

In high school, Max's only real friend was Peter Parker, a fellow social outcast. As a result, Max was targeted by Flash Thompson, who often called him "Parker's boyfriend". Like Peter, Max had a crush on popular girl Liz Allan, but kept this fact secret even from Peter. Over time, Max's feelings for Liz turned into a twisted obsession; when Peter informed him that Liz was dating Flash Thompson, that obsession turned into hatred.

Becoming Electro
During the summer vacation leading into their senior year of high school, Max worked as an intern at OsCorp, maintaining a few vital systems. One day, while working late, curiosity got the better of Max and he began snooping around one of the labs, where he discovered one of OsCorp's research projects into the military applications of bioelectrogenesis - an idea taken from Doctor Curtis Connors after the liquidation of Horizon Labs.

When security guards barged in to take Max away, he panicked and attempted to flee, only to accidentally fall into a tank full of genetically modified electric eels, who zapped him to near-death. OsCorp covered up Max's supposed death by saying he was electrocuted while checking a faulty cable.

However, it was later discovered that Max had somehow survived the ordeal and inherited the eels' genetic enhancements, turning him into a living electrical capacitor. Norman Osborn considered him their first successful test subject and kept him around, intending to use Max to power OsCorp's headquarters.

This proved to be a tremendous mistake, as when Max awoke to the pain of being experimented on, he panicked and managed to successfully escape back into the city, where he set out on a quest for revenge against everyone who kept him down in the past - starting with Liz.

Trivia

 * Max is bicurious, and often wrote in his private journals about his jealousy towards Flash Thompson's appearance.