Aka is a character from the anime series Reborn as a Vending Machine, I Now Wander the Dungeon. Aka is a member of the adventurer party known as the Menagerie of Fools, a group led by the skilled but arrogant warrior Kerioyl. The party is initially presented as a competent and somewhat notorious team operating within the dungeon, and Aka's role is as one of its members.

Aka has a brother named Shino, and together they are the sons of the party's leaders, Kerioyl and Filmina. This family dynamic is a central secret within the group's story, as they are later revealed to be working together. The family's primary motivation is not adventure or fame, but the desperate need to save their third son, who is Aka's brother. This other sibling is afflicted with a terrible curse that causes his body to rapidly decay. To prevent his death, the family has placed him inside a magical crystal that slows the curse's progression. Their secret cooperation with the Netherlord, a major antagonist, is done in the hopes of obtaining a cure for him.

Therefore, Aka's role in the story is deeply tied to this family secret and the moral ambiguity that comes with it. While Aka is a member of the Menagerie of Fools, his and his family's actions are driven by a desire to save a loved one, which puts them in opposition to the main characters when their secret alliance is discovered. The narrative does not provide extensive individual detail on Aka's personal abilities or personality, but frames him as part of this family unit, with his motivations being intrinsically linked to their collective goal. His character development is intertwined with the revelation of his family's circumstances, shifting his perception from a simple party member to someone acting out of familial loyalty in a dire situation.