Galahad (ガラハッド, Garahaddo?), Class Name Shielder (シールダー, Shīrudā?), also going by the name Tachie (タチェ?), is a heroine of Fate/stay night introduced in Fate/unpublished material and Shielder-class Servant of Ernest Gravehill. She is currently a Stray Servant.
Galahad was placed inside the resurrected body of a girl who died in the Fuyuki Fire at the end of the Fourth Holy Grail War. Ernest Gravehill, a necromancer, performs this ritual to help reduce Magical Energy expenditure while summoning Galahad as his Servant.
Shielder initially displays no personality, being like a robot who follows her Master Ernest's instructions. The two personalities of Tachie and Galahad emerge as time progresses, and she becomes increasingly savage as she regains her identity. Tachie's personality switches randomly with Galahad's, making it seem as if she has a double persona. She holds a grudge against Shirou Emiya because she felt that he abandoned her when she called for help in the fire.
The plot outlined in Fate/unpublished material describes first an anime series similar to the Fate route but featuring Tachie and her Master as the seventh Servant instead of Assassin, and then a movie that would have an original route highlighting Tachie's backstory.
Ernest and Shielder would have made their first appearance when Shirou, Saber, and Rin Tohsaka first visited the Fuyuki church. They were already present at the church by the time Shirou, Rin, and Saber arrived. At some point Ernest would have dropped out of the Grail War, leaving Shielder as a Masterless Servant wandering Fuyuki.
In the anime series, Tachie would have died to Gilgamesh after he interrupted a battle between her and Saber. The movie would have ended with Tachie coming to terms with her death and Shirou's survival, and saving Shirou before disappearing.
Her Noble Phantasms are Around Round Shield: Fragment of Time that Indicates Calamity (災禍指す時の断片, Saika Sasu Toki no Danpen?) and Lord Camelot: The Round Table of a Renowned Time (誉れ高き時の円卓, Homaretakaki Toki no Entaku?).
Creation and Conception
Known as the Stray Servant (はぐれ サーヴァント, Hagure Sāvanto?), Shielder was a heroine candidate during the development of Fate/stay night who was left unused in the final version. She was considered along with Rider and Caster to be a possible heroine, but she was cut due to the plot beginning to stray so as to keep it manageable for the player. As Saber is a "Servant of the Sword", she was to be her rival as a Shielder, "Servant of the Shield." She would have been an "abandoned puppy" type heroine who killed her Master during the Fourth Holy Grail War and went on a rampage, surviving into the Fifth Holy Grail War in a similar manner to Gilgamesh.
Her scrapped role for the visual novel was originally only detailed in Fate/side material, but later it was planned that she would be a character in what was to be the original story of Studio Deen's Fate/stay night adaptation. Her character design by Takashi Takeuchi was completed at that time, but the anime was later changed to an adaptation of the Fate route and the character was again abandoned. There was a plan for an anime original film featuring the character, but the storyline and designs went unused. Despite the scrapped plans, the mention of a Stray Servant is mentioned by Saber in Episode 17, just prior to Shirou and Saber heading out to Ryudou Temple.
The notes from the anime original film were collected and revised in the Fate/unpublished material booklet released on the fifteenth anniversary of Fate/stay night in 2019.
- Fate/unpublished material
- Fate/Grand Order interview
 Fate/side material - Encyclopedia: Stray Servant [Others], p.069 [T]
Stray Servant [Others]
A heroine candidate that vanished without a trace during the plotting stage.
She was conceived of as an "abandoned puppy" type heroine, who killed her Master and went on a rampage.
As a Servant of the shield, she was going to be a rival to Saber, the Servant of the sword, but…
Just like Gilgamesh, she would have been a Servant that had remained behind after the previous Grail War.
Unfortunately, though, she had to be cut for the sake of keeping things manageable for the player.
After all, around this point, the plot itself was starting to stray. Not only Rider, but even Caster was a potential heroine candidate. It was terrifyingly chaotic.
Hmm? Fuji-nee? I don't know what you're talking about, Fuji-nee never had a main route even during the plotting stage.
Grand Order 4Gamer interview
4Gamer： So it really is a shield, then. Did you design her, Takeuchi-san?
Takeuchi: Yes. But that shield girl's design existed before this project began.
Nasu: It never came to be, but when Studio DEEN made their "stay night" anime, it was originally planned to have an original story. This heroine was formally made back then. We felt it was a waste to keep her locked away like that, and she fit right into the story of "FGO", so we decided to make her the main heroine this time around.
4Gamer： So, is her true identity to be revealed at a later date?
Takeuchi: It's too early (laugh). Trying to figure out a heroic spirit's true name-- their identity, is a big part of the enjoyment of "Fate".
Nasu: In "FGO's" case, the servant's identity becomes revealed once players get their hands on them. So I'd be happy if all the players would do their best to avoid spoilers.
奈須氏： >世に出ることはなかったんですが，以前スタジオディーンさんが「stay night」をアニメ化されたとき，オリジナルの話を作る予定があったんです。このヒロインは，その時に正式に作られたキャラクターでした。そのまま眠らせておくのはもったいない気持ちがありましたし，「FGO」のストーリーにハマる感触もあったので，今回メインヒロインとして立ってもらうことにしました。