The only redeeming candidate in his castle was Mira, the daughter of a 4th Star Archmage. She had twin elder siblings who were both Rank 9 mages.
She was the best among all the candidates here and that was the reason he befriended her and drew her closer to his side. Both of them became the de facto leaders of the castle, and she was responsible for the overall organization, with Andar giving directions from the background.
As the daughter of an Archmage, she needed to be seen as a leader and Andar had no problem with making her his partner, with her talents, she could go far as a Mage.