Seven Servants and three Pseudo-Servants appear in the animated special Fate/Grand Order x Himuro's World: Seven Most Powerful Great Figures Chapter. Aside from the Pseudo-Servants, they are all from the Fate/school life Servant creation contest. The Holy Grail War is revealed to have been a story by Yukika, so it is unknown how they apply to actual series' lore.
Lê Lợi (黎利, Rei Ri?), True Name Saber (セイバー, Seibā?), is the Saber-class Servant of Kane Himuro.
In the story, she kills Berserker and fights Caster before being sent flying by Plato.
Mehmed II (メフメト2世, Mefumeto 2-sei?), Class Name Archer (アーチャー, Āchā?), is the Archer-class Servant of Ayako Mitsuzuri. There is another rendition of Mehmed II in Fate/Apocrypha.
In the story, he and his master observe Caster defeating Lancer.
Lucky Mother (ラッキー・マザー, Rakkī Mazā?), Class Name Lancer (ランサー, Ransā?), is the Lancer-class Servant of Issei Ryuudou. She is the Mitochondrial Eve (ミトコンドリア・イヴ, Mitokondoria Ibu?).
In the story, she fights Caster, evading her rockets in mid-air before being caught in a blast of flame along with her master.
Diogenes (ディオゲネス, Diogenesu?), Class Name Rider (ライダー, Raidā?), is the Rider-class Servant of Kaede Makidera.
In the story, he and his master are incinerated mid-flight by Caster's flames.
Leo III (レオ3世, Reo 3-sei?), Class Name Caster (キャスター, Kyasutā?), is the Caster-class Servant of Saeki Naomi.
She carries a tube which she uses to launch rockets, emit fire and for propulsive flight.
In the story, she defeats Lancer and Rider, and fights Saber before being sent flying by Plato.
Nevil Shute (ネビル・シュート, Nebiru Shūto?), Class Name Berserker (バーサーカー, Bāsākā?), the Berserker-class Servant of Gai Gotou.
His body is that of a Panjandrum, with arms, legs and a mask-like face protruding from it.
In the story, he appears when his master confronts Kane Himuro outside the school, and while distracted by the sight of him being beaten up by her, he is killed by Saber.
Plato (プラトン, Puraton?), Class Name Ruler (ルーラー, Rūrā?), is the Ruler-class Servant of Yukika Saegusa.
In the story, he breaks up the fight between Saber and Caster at his master's request, sending both of them flying.
Takuboku Ishikawa (石川 啄木, Ishikawa Takuboku?), Class Name Assassin (アサシン, Asashin?), is an Assassin-class Pseudo-Servant inhabiting the body of Kaede Makidera.
Amelia Jenks Bloomer
Amelia Jenks Bloomer (アメリア・ジュンクス・ブルーマー, Ameria Junkusu Burūmā?), Class Name Caster (キャスター, Kyasutā?), is a Caster-class Pseudo-Servant inhabiting the body of Kane Himuro.
She is summoned after Kane had rejected the previous options presented to her by the Counter Force (Taro and Jiro, Laika, New Nessie and Kajikawa Yosobei).
Friedrich Nietzsche (Yukika)
Friedrich Nietzsche (フリードリヒ・ニーチェ?) appears as a Pseudo-Servant inhabiting the body of Yukika Saegusa. Her class is unknown.