Jacob Omari was a young lad residing in a safe house provided by Rex Gallagher, along with his mother Kat Omari.
Having not left the safe house since he first arrived, Jacob began writing notes under the alias of 'J' and slipping them into Rex's backpack. Using the notes to his advantage, Rex played a game with Lexi Roscoe and Curtis Royle, as they thought 'J' was their imaginary friend who they were communicating with through letter hidden in the bag. However, as Rex had also been involved in dodgy dealings at the time the notes were being distributed, he panicked when Lexi grabbed his bag one day and caused her a head injury which resulted in her diagnosis of epilepsy.
When Ste Hay, who had been struggling coming to terms with the loss of husband James Nightingale, found notes written by 'J' in Rex's possession, he wrongly assumed that James was actually alive and being kept hostage by Rex somewhere.