But unlike some of his terrorist comrades, he always remained under the radar, reluctant to allow his identity to be shared online or in propaganda videos.
One of his close associates told ITV News: “He was a psychopath… trying to fulfil his violent and criminal fantasies with God’s stamp of approval.”
Elberghouzi is understood to have gone to school in west London with Kotey, who along with Elsheikh are now being held in Syria awaiting extradition to the United States.
The pair face the potential death penalty if convicted of terrorist offences.
According to ITV News, Elberghouzi was a passionate Arsenal fan when he was growing up, and enjoyed going to the gym and playing football.
But he travelled to the middle east when he was aged 20, on board an aid convoy.
He later entered Turkey from Greece, before traveling over the border into Syria, where he joined Isil in its formative days.
He allegedly travelled with Tarik Hassane, who later returned and is now serving life in prison for a plotting to kill police officers, soldiers and civilians in London.
Hassane, 24, who also grew up near Elbergouzi, was nicknamed the Surgeon because he was studying medicine in Sudan.