808 is a prominent character in the rhythm-action game Hi-Fi RUSH. This character is a cat-like robot companion that aids the protagonist, Chai, on his journey through a futuristic world filled with rhythm-based challenges and enemies. 808 acts as both a guide and a support character, providing Chai with crucial information, hints, and emotional support. The character's design is both sleek and cute, making it a fan favorite. 808's presence adds depth to the storyline, and its interactions with Chai help to develop the game's narrative and emotional resonance.