Twenty-two people were killed and 59 others injured when a suicide bomber struck as thousands of people streamed out of an Ariana Grande concert at Manchester Arena.
Many of the victims were teenagers or children who had been seeing the pop superstar perform.
Among them was eight-year-old Saffie Rose Roussos.
Her head teacher at a primary school in Lancashire, Chris Upton, said she had been "simply a beautiful little girl in every aspect of the word", the BBC reported.
"She was loved by everyone and her warmth and kindness will be remembered fondly," Mr Upton was quoted as saying.
A second victim was 18-year-old Georgina Callander, a massive Grande fan.
Her school, Runshaw College, announced with "enormous sadness" that one of their health and social care students had died.
On Facebook, a friend remembered Georgina was "the sweetest, most loving soul", while others remembered her as one of the "loveliest people".
Friends also paid tribute to her "kind hearted" nature, saying she "always lit up the room".
"Heaven has gained an angel," actress and singer Karen David wrote on Instagram, saying she had recently met Georgina.
Bolton Wanderers Football Club, where Georgina played in 2010, expressed its shock.
"Our thoughts and prayers are with her friends and family during this awful time of loss," club chaplain Phil Mason said.
Tributes were also paid to competitive dancer John Atkinson, 26, from Radcliffe.
Mr Atkinson was reportedly leaving the venue when the attack occurred.
His local dance troupe posted on Facebook: "Today is an amazingly sad day! We have lost a member of our dance family.
"He was a true friend, not just to our staff but many of the parents and students from the school. Our thoughts are with the family at the very sad and hard time!"
"John was one in a million and loved by so many, a true gentleman," a post on a GoFundMe page raising money for Mr Atkinson's family reads.