Epona Rhiannon (エポナ・リアンノン) is a supporting character in Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru 2nd Season, voiced in Japanese by Sumire Uesaka. The series' music includes "The World's Finest Assassin - Opening | Dark Seeks Light", "Sekai Saikou no Ansatsusha Isekai Kizoku ni Tensei suru ED Full『A Promise』 Nightcore/Vocaloid".
