The American Nomads
Garret is a lone nomad who agrees to be a witness for the Cullens against the Volturi. He starts a friendship with the Denali sisters, Kate and Tanya. He stops Kate from attacking the Volturi when they kill her sister Irina. He also tells the other nomads in the group of Volturi witnesses that the Volturi don't stand for justice, but for power. He says that that siding with them means giving up power over their own lives. His speech causes many of the Volturi witnesses to leave.
Peter & Charlotte
Peter and Charlotte are old friends of Jasper, who agree to serve as witnesses for the Cullens.