Alpha is a pet kitten belonging to Rem Ayanokōji, serving as a combat support companion during supernatural confrontations. Alpha can transform from a small kitten into a larger, fiercer wild cat form, specifically to battle dream demons and other supernatural threats. This transformation ability is used in both dream realms and the physical world to aid Rem in her missions. Alpha operates alongside Beta, Rem’s pet puppy, who similarly transforms into a large wild dog. No backstory, origin, personality traits, or character development for Alpha is documented, and the character does not speak or show independent agency beyond directly supporting Rem’s actions.