HorsegiirL hides her identity behind a chestnut-coloured horse head mask; Berlin-based HorsegiirL describes herself as "half-horse, half-human". She told i-D in September 2023 that she uses the real name "Stella Stallion", grew up on "Sunshine Farms", and had gone from "making up her own melodies in her head when she was a young foal" to being "discovered by Whitney Horston at a harvest fest" as a teenager. She listened to the likes of Crazy Frog and Hampton the Hamster growing up. A February 2024 ABC News article described her as a "Black woman/horse/DJ", and of Mustang and Haflinger descent on her equine side.