Isaiah

Isaiah was an ex-boyfriend of Smurf's mother from when she was a child who gave Smurf her nickname.

Background
When Smurf was twelve or thirteen, her mother Miriam dated Isaiah who gave Smurf her nickname due to Smurf's love of swimming until she turned blue. Isaiah cared deeply for Smurf and would state years later that she was the real reason he had stayed with Miriam for so long. Along with Smurf's mother, Isaiah did a lot of drugs and small-time robberies to pay for the drugs while following bands around. During one robbery of a convivence store, things went bad and Smurf's mother was killed. Isaiah took off in her car, leaving Smurf behind outside of the convivence store.

Isaiah eventually married and had at least one kid and several grandkids. He and his wife divorced and she moved to Connecticut with their family.

Season 1
While investigating where J disappeared off to, Smurf recognized Isaiah in an old picture shown at a photography exhibit J visited and tried to find out where he was. The photographer eventually revealed to Smurf that Isaiah had contacted her a couple of years before having changed his name and wanting the print and negatives for his picture. She was able to point Smurf to the airplane hanger in Santa Clarita that Isaiah owned and used to sell antique cars while Smurf began remembering her past with him.

Smurf eventually tracked Isaiah down, claiming to be a woman named Rachel trying to buy one of his cars. Isaiah failed to recognize Smurf who recognized one of his cars as her mother's and asked him about his life and claimed that she got her love of antique cars from her mother. The two later shared dinner where Smurf pressed Isaiah for more information on his past and considered shooting him. After returning to his shop, Smurf asked Isaiah about her mother's car which he revealed was his first car which he would never sell despite it being a "total clunker." Isaiah explained how he inherited the car from a woman who had lived it in for years with her kid. Isaiah admitted that the real reason he had stayed was for Miriam's daughter who he had nicknamed Smurf. Isaiah talked about young Smurf with great fondness, unaware that Rachel was really the girl he had once cared for so much. When Isaiah left to get some champagne, Smurf left without saying a word.

Weeks later, Smurf returned to Isaiah's shop and followed Isaiah, still driving Miriam's old car, home. Isaiah was surprised to see "Rachel" who shot him twice in the chest. As Isaiah stared up at her in shock, Smurf stated that "people call me Smurf now" before shooting Isaiah through the right eye in revenge for the death of her mother.