Aeren

Aeren, like Meum and Ferro, was also from a pack long gone (once again, I'll leave it up to interpretation what happened to his old pack). Used to the safety and protection of a pack, he was never hostile to other lone wolves unless they were to him. The grief of losing his old packmates was also a big part of that.
Aeren was empathetic for Meum and Ferro when he learned they were from a disbanded pack too, and volunteered to join them when he learned they wanted to make a new pack. He was loyal to Hollow Trees, and treated the wolves there like he would his old packmates. He stuck with his new pack through thick and thin, and because he was one of the first wolves to join Meum's pack, he was also friends with the founders themselves.
He was surprised it grew so fast though. After a while, it turned from a pack to a kingdom, and he was certainly proud. It was just unexpected.