Alpha consistently appears across all official Rem Ayanokōji media as her pet kitten. This character functions exclusively as a combat support unit during Rem's missions. Alpha possesses the ability to transform into a larger, fiercer wild cat form specifically when confronting dream demons or other supernatural threats.

Alpha utilizes this transformation ability uniformly throughout the franchise, fighting alongside Rem in both dream realms and the physical world. Alpha operates in conjunction with Beta, Rem's pet puppy who transforms similarly into a large wild dog; however, no distinct relationship dynamics or interactions between Alpha and Beta are detailed.

Alpha's role is strictly defined as a combat asset. No backstory, origin, personality traits, or character development for Alpha are documented in any installment. The character does not speak and exhibits no independent agency beyond directly supporting Rem's actions. This functional portrayal remains consistent across all sequels and adaptations, including the New Dream Hunter Rem OVAs (1990-1992), manga adaptations like Dream Hunter Rem XX (2009) and Dream Hunter Rem Alternative (2011), and novelizations.

Alpha possesses no additional abilities beyond the established combat support function and holds no narrative significance or evolution in any official media.