Aki is a female streamer from Spain that streams a variety of things; games, reactions, karaoke and more. She's a member of HI!ME, a vtuber group of friends.
Aki is an undefined spirit, but the closest word to describe her is a yōkai / gwishin / jiangshi. She lives in purgatory, where she's the one in charge of welcoming souls to "the other side" before judging them so they can be sent to either heaven or hell. She has a lot of minions under her command, most of them souls she kept, that with time, lost their shape and memories, and call her "boss".