Issa is a panda-like creature and a core member of the "Happy AniYoko Trio," self-identifying as its empathic heart. His primary role centers on persistently striving to maintain harmony between fellow trio members Iyo and Kenta, though his peacemaking efforts consistently fail. He exhibits a generally kind and considerate nature, making deliberate efforts to be pleasant towards Ami, the young human girl hosting their visits through the doorway in her bedroom floor leading to their world, AniYoko.

Born on November 23rd, he is a Sagittarius. While his exact age varies, he is sometimes referenced as being three years old. Unlike Iyo, who possesses special abilities like the "Iyo-pe Beam" and ear storage, or Kenta with his defining red scarf, Issa has no documented unique physical powers or signature accessories. His characterization focuses on his interpersonal mediation role and self-professed empathy.

His relationships drive his interactions. With Ami, he displays protectiveness and a consistent desire to be helpful and friendly. He often becomes the target of Iyo's teasing and scare tactics, reacting with visible fear to her ghost stories and pranks. His dynamic with Kenta involves frequent attempts to intervene during arguments or conflicts, typically between Kenta and Iyo, though these interventions rarely resolve the tensions. His existence is intrinsically tied to AniYoko, an alternate dimension accessible solely through Ami's door, with the world itself remaining largely unseen and mysterious.