The Lostbelt version of Ivan the Terrible, real name Ivan IV Vasilyevich and also known as the Thunder Emperor, is a major antagonist in Fate/Grand Order: Cosmos in the Lostbelt and the first of the seven Lostbelt Kings to be confronted.
He serves as a major antagonist in Anastasia: The Permafrost Empire. He is also summonable as a Rider-class servant in the gameplay.
He is voiced by Takaya Kuroda (who also voices Risotto Nero in JoJo's Bizarre Adventure: Golden Wind, Yaiba of Darkness in GoGo Sentai Boukenger, Samejima in Inuyashiki, Mordegon in Dragon Quest XI, Dharak in Bakugan: Gundalian Invaders, Rei Amayado in Hypnosis Mic: Division Rap Battle, Tartarus in Dragalia Lost, Albinoleo Imagin in Kamen Rider Den-O, Roidmude 5886 in Kamen Rider Drive Saga: Kamen Rider Heart, Set in Sacrificial Princess and the King of Beasts, Eriedrone in Uchu Sentai Kyuranger, Lord Darcia III in Wolf's Rain, Masashi Miyamoto in Btooom!, Shadon in Mashin Sentai Kiramager, and Debo Honenukky in Zyuden Sentai Kyoryuger) in the Japanese version