Members of the boy's family held a vigil and prayers at the site he was killed, leaving flowers to commemorate him.
They have repeatedly called for peace and forgiveness.
The teen's friend, Veni Atonio, led the group in a prayer.
"We have to have love," he said.
He described their friend, who they knew as Solo, as "a humble man".
ABC News reports the captain of the teenager's school, Poasa Telepe, urged the crowd not to seek revenge for Solo's death.
"These gangs need to stop. This fighting needs to stop," he said.