An umamusume character. An energetic athlete who represents the new umamusume mode "U.A.F." along side with Tsurugi Ryoka.
She is reportedly based on Osumi Eleven, a racehorse who achieved Open class on dirt but later turned to Dressage. Osumi Eleven's dam, Rosita, was both long-lived and foaled many foals, of which, Osumi Eleven was the last born. "Sonon Elfie" is based on the name of two of his siblings: Sister Sono and Elfin. Osumi Eleven's sire was Kurofune, from which he got his grey coat (and consequently, why Sonon Elfie's hair is grey).
