Kelvin Odunuyi, 19, was gunned down as he stood with friends at the entrance of the Vue cinema in Wood Green, at just after 12.30am yesterday.
Witnesses described seeing two masked men on a moped ride past before one opened fire.
Mr Odunuyi, a rapper who performed under the name DipDat and was also known as Lampz, was pronounced dead in hospital two hours later.
The killing, the first fatal shooting of a teenager in London in 2018, is thought to be part of an escalating “postcode war” between gangs in Wood Green and nearby Tottenham.
It follows the murder of youth worker Kwabena Nelson, 22, who was stabbed to death last month just yards from his home in Tottenham.
A police source confirmed the killing was being treated as gang-related.
It was claimed that like Mr Nelson, Mr Odunuyi was not a gang member, but socialised with people who were.
His mother, Afishetu Oniru, said he was in the “wrong place at the wrong time”.
At the family home in Harrow today, she told the Standard: “He was a lovely jovial boy. He was clever and loved by all who knew him…he had everything going for him.”
Mrs Oniru said relatives, including his father who runs a property business in Nigeria, had paid her son’s fees at the prestigious £26,000-a-year Fulneck School in Pudsey, West Yorkshire, as a boarder, and that he had ambitions to work in the oil industry.
He moved to Heartlands High School in Wood Green.
She said: “We sent him away because it was the best school for him. I have always lived in London but when we moved to Wood Green for a short time I got scared for my family.
“We now live in Harrow and I told him not to go back to Wood Green to see friends. But he did and now he is dead after being shot dead in a random attack. Police said it was wrong place at wrong time.
“He was with a big group when two boys on bicycles came along shooting – he was hit, it’s a tragedy. I am devastated.
“I knew he would be safe at home with me but he went there and now he is dead. Another mother is grieving, enough is enough, the government needs to act to stop the bloodshed.”
Mr Odunuyi’s sister, Annabel, 16, added: “He wasn’t just my brother, he was my best friend. Everybody loved him, he made everyone feel good. I am heartbroken.”
Former classmates described Kelvin as a popular boy with “bags of potential”.
One said: “He was always a generous, cool person who was always cracking jokes in school,” adding: “My generation has been corrupted with this idea that gang violence is cool. What people forget is that you’re taking someone from their families.”
Footage said to have been filmed by Mr Odunuyi outside the cinema minutes before the shooting was being shared on social media today.
An image also emerged which appeared to show Mr Odunuyi lying in the foyer surrounded by armed police and shocked onlookers after being shot.
A witness said: “I saw these two boys in balaclavas on a black scooter come round the corner and the one on the back opened fire as they were rolling past.
“I saw his body on the floor his friends were around him. I didn’t know until later it was Kelvin. It’s a warzone round here.”
Last night, devastated friends gathered outside the closed cinema to lay candles, flowers and bottle of spirits in his memory.
There have been no arrests.
Detective Chief Inspector Luke Marks said: “We believe two people made off on a moped shortly after the incident and this is one line of enquiry that we’re actively pursuing.”
Anyone with information should contact police on 02083580200 or Crimestoppers anonymously on 0800 555 111.