The boy denied the charges, claiming he adopted the persona for its "shock value" but was found guilty of all of them at Manchester Crown Court on Wednesday.
Prosecutor Michelle Nelson QC told the court that attacking people "who had no place in the new world order" was something the defendant "saw as part of generating race war and chaos".
Detective Chief Superintendent Martin Snowden, who heads Counter Terrorism Policing North East, said: "The extreme right wing views and hateful rhetoric displayed by this teenager are deeply concerning and we cannot account for those who may have been susceptible to his influence or how they may act in the future.
“His extensive repetitious internet searches, diary entries and escalating behaviour combined with his desire for notoriety highlight how dangerous he could have become had he not come to the attention of the authorities.
He will be sentenced on January 7, 2020.
