Ricky is a character mentioned in The Kill Order. Nothing is known about him except he is Deedee's brother. Ricky's fate is unknown, but as he was not Immune, it can be presumed that he either succumbed to the Flare and eventually died, or was killed by another Crank.
A year after the Sun Flares, Ricky and his family lived in a village just a few miles from Mark's village. His parents and sister, Deedee, were hit by PFC darts containing the Flare virus. When the Flare began to spread, the villagers quickly realized Ricky's sister was Immune to the virus. Deedee was thought to be a demon of some sort and was abandoned by everyone, including her own brother.