User blog:FDN/Servants not yet summonable in FGO

I tried searching online for this kind of list multiple times but didn't find anything so I'm trying to do it myself. For now I only included servants not originating from FGO, mainly because I'm lazy and also because this info can be found here (scroll down).

Mentioned potential servants (not actually seen)

 * Sabers
 * Abraham Lincoln
 * Captain Kidd
 * Edward, the Black Prince
 * Fionn mac Cumhaill
 * Hector
 * Heracles
 * Joan of Arc
 * Minamoto no Raikou
 * Nagao Kagetora
 * Queen Victoria
 * Sherlock Holmes
 * Spartacus
 * Tristan
 * Watanabe no Tsuna
 * Archers
 * Christopher Columbus
 * Edward, the Black Prince
 * Lü Bu
 * Kama
 * Karna
 * Penthesilea
 * Rama
 * Penthesilea
 * Urabe no Suetake
 * Lancers
 * Achilles
 * Heracles
 * Ishtar
 * Jason
 * Lü Bu
 * Mori Nagayoshi
 * Penthesilea
 * Rama
 * Usui Sadamitsu
 * Riders
 * Bradamante
 * Brynhildr
 * Gaius Julius Caesar
 * Gilles de Rais
 * Heracles
 * Jason
 * John Hawkins
 * Karna
 * Leonardo da Vinci
 * Lü Bu
 * Mori Nagayoshi
 * Nagao Kagetora
 * Napoleon Bonaparte
 * Parvati
 * Penthesilea
 * Scipio
 * Siegfried
 * Theseus
 * Toyotomi Hideyoshi
 * Usui Sadamitsu
 * Wright Brothers
 * Casters
 * Amakusa Shirou Tokisada
 * Agrippina
 * Fionn mac Cumhaill
 * James Moriarty
 * Peter the Cruel
 * Queen Victoria
 * Sigurd
 * Vasco da Gama
 * William Wordsworth
 * Assassins
 * Calamity Jane
 * Heracles
 * Lü Bu
 * Okita Souji
 * Berserkers
 * Abraham Lincoln
 * Achilles
 * Brynhildr
 * Charles VII
 * Cú Chulainn (normal, without the influence of the 5th Singularity)
 * Enkidu
 * Jack the Ripper
 * John Hawkins
 * Mordred
 * Robert Bulwer-Lytton, 1st Earl of Lytton
 * Romulus
 * Rulers
 * BB
 * Robert E. Lee
 * Saint Martha (not swimsuit)
 * Avengers
 * Captain
 * Quetzalcoatl
 * Robert E. Lee
 * Chacha
 * Alter Egos
 * Tamamo Cat
 * Tamamo Delmo
 * Tamamo Gucci
 * Tamamo Aria
 * Tamamo no Hime
 * Foreigner
 * Altera (Moon)
 * Shielder
 * Achilles
 * Leonidas
 * Ajax
 * Galahad (not Demi-Servant)
 * Saver
 * Kiara Sessyoin
 * Gunner
 * Billy the Kid
 * Nameless
 * Gatekeeper
 * unknown
 * Funny Vamp (does this one event count?)
 * Arcueid Brunestud
 * Unknown
 * Nebuchadnezzar II
 * Hydra
 * Scylla
 * Dong Bai
 * Theseus
 * Xian
 * Taro and Jiro
 * Laika
 * New Nessie
 * Kajikawa Yosobei

That was more than I expected... There are also servants from the first 3 Fuyuki HGWs that (iiuc) we know nothing about except that they exist. We may have seen some of them elsewhere, who knows.