Chloë Grace Moretz Nimona (voice) Riz Ahmed Ballister Boldheart (voice) Eugene Lee Yang Ambrosius Goldenloin (voice) Frances Conroy The Director (voice) Lorraine Toussaint Queen Valerin (voice) Beck Bennett Sir Thoddeus Sureblade (voice) RuPaul Nate Knight (voice) Indya Moore Alamzapam Davis (voice) Julio Torres Diego the Squire (voice) Sarah Sherman Coriander Cadaverish (voice) ND Stevenson Kwispy Dwagon (voice) Nick Bruno Sir Nicholas Brun / Additional Voices (voice) Troy Quane Sir Troy Quartermane / Additional Voices (voice)