Al/Relationships

Priscilla Barielle
Although he was bribed to be with her, Aldebaran later on realized that he really wanted to protect her and although he usually receives blows from Priscilla, he continues to accompany her.

Schult
Schult and Al both care about each other, since Aldebaran suffers a lot when Priscilla hurts him.

Rem and Ram
Al seems to be acquainted with Ram as he mistook Rem for her older sister during the third failed loop of Arc 3. Throughout their following short interaction, Al expressed his shock at realizing he was speaking with Ram's sister, indicating he only knew of her existence and not of Rem's. Soon after, he turned extremely hostile though managing to contain himself in mere seconds. After Rem and Subaru departed from Priscilla's manor, Al seemed to have gained somewhat of a grasp on the situation; a situation that made him want to vomit.