Familiar

are special assistants used by magi. Since it's natural for a magus to separate himself from society, the use of familiars capable of performing small, simple errands is considered orthodox. 
Although a different entity, familiars are seen as an extension of the magus as there is both a mental and physical connection between the two. The symbol of the magus itself and fundamentally different from creatures like the Daemons or Spirits who are summoned and then bound by a contract.
==Nature==
There are several ways to create a familiar. The most traditional is by placing the leftover thoughts of an already departed soul, of a dead human, into the body of a dead animal. Following that, the magus needs to repair the animal corpse so that it can move again and by transferring a part of the magus body, that has a great concentration of Magic Circuits (eyes, hair, blood, etc.), into the body of the dead creature in order to give it a new life.Kagetsu Tohya - Twilight Glass Moon, Fairy Tale Princess - a day - Streets - Evening - Arcueid's room Hair that is loaded with the weight of years and thoughts can be considered a true copy of the magus, so when you give this kind of thing when resurrecting a dead dog or cat, you get a familiar subject to the magus, and the older the hair, the more powerful the familiar created will be.Mahoutsukai no Yoru - Chapter 10: "Howling at the Moon" 
By absorbing the body part, the resulting familiar will gain Magic Circuits that the original never had before in its previous life and will be able to use magecraft just like the magus. However, magical energy cannot be produced independently and must be supplied by the magus through their spiritual connection. Thus, a familiar requires a master to maintain both its powers and life. The creator magus is typically addressed as “master,” and is tied to the familiar by their spiritual connection. The connected familiar is endowed with a portion of its master’s abilities, but not so much that it surpasses its master.
When reborn, the familiar has now become a completely different being. For example, it can understand the language of men or transform into a human. Its behavior also changes, and in general, it adopts the temperament of its master. This type of familiar will form its own personality and will be capable of reasoning and acquiring experience apart from the magus while sharing the same knowledge. Magi need something that has about the same level of rationale and reasoning, but can think independently. That way they can act as a teacher, and have the familiar be a teacher to them, and help compensate for the magus' weaknesses. It is better to discover new things that way, and it also makes it easier for them to realize their own mistakes. 
There is also a chance of the arising of abnormal powers. A good example of this would be Len, who not only has Succubus-like aspects but is also capable of living for long periods of time without a master and forging contracts with individuals other than her creator. However, the presence of a personality also makes this type of familiar more independent from the magus and many magi really do not like that method. But some magi make insurance by passing everything on to their familiars. To explain it simply, it is a spare self that is a little behind on abilities. Important to note that this is by no means a form of resurrection, as the familiar is still a being completely different from the one whose soul it received.
==Additional notes==
Familiars like the ones mentioned above can be made out of pretty much any creature: cats, dogs, birds, etc. Actual, living animals can be turned into familiars as well and magi prefer this type more as other types since they are quick to create and are easy to control. But these animals become magical monsters over time and the best example for this are the Crest Worms who make up the body of Zouken Matou. 
Humans can also be turned into familiars, but that is seen as a monstrous act and impractical (due to the magical energy burden) by most magi. Also, familiars without souls can be used, however the modern versions of these are weak.
Completely different types of familiars also exist. Examples of those include magic constructs such as Touko Aozaki's Puppets, magical plants like Harriet Frise's Alraune, Golems, Dolls and spiritual beings such as Apparitions.
Nrvnqsr Chaos's 666 beasts (or rather body itself) are also familiars. What makes these particularly different from other familiars are that they all are generally equal in power as each one of them is Nrvnqsr himself.
Transfer of the master's consciousness into the body of regular familiars is possible and most magi do so to remote control them while they are out on recon or exploring missions. However, it is impossible to take control of a familiar that has its own soul and personality. In this case, the best that the magus can hope for is to share the familiar's senses (like receiving a video-feed of everything that the familiar sees and hears). Even transference into a familiar without a soul doesn't mean that the magus has completely transferred himself. Destruction of the body (this also includes through natural means like aging) of the magus will mean the destruction of the soul of the magus. But there are ways to get around this, for instance, complete transference of the soul using the Dress of Heaven, Michael Roa Valdamjong's (Remake) resurrection, or the vampiric method that Zouken Matou had resorted to.
==List of Familiars==
*Achat, Shtayim, and Shalosh - Queen of Sheba
*Alraune - Harriet Frise
*Amethyst owl - Rin TohsakaFate/stay night - Unlimited Blade Works route - Day 11: WitchCraft - Interlude 11-2: Witch's plan
*Aoko Puppet - Touko Aozaki
*Bacteria - Yuukaku KuruokaFate/strange Fake Volume 6 - Interlude: "A Mercenary is a Free Man I"
*Bats - Maiya HisauFate/Zero Volume 1: The Untold Story of the Fourth Holy Grail War - Act 3 Part 1 -162:26:39
*Bees - Haruri BorzakFate/strange Fake Volume 4 - Chapter 11: Day 2, Morning "The Gods Return From Twilight"
*Birds - Faldeus DiolandFate/strange Fake Volume 1 - Prologue VII: “Visitor & ●●●●"
*Black hounds - Cornelius Alba, Misaya Reiroukan
*Butterflies - Orlocke Caesarmund,Lord El-Melloi II Case Files Volume 1: case. Adra Castle Separation - Chapter 5 Part 2 Verner CaesarmundFate/strange Fake Volume 7 - Bridge Chapter: "Beginning of the End"
*Cath Palug - Merlin
*Condor - Tiné ChelcFate/strange Fake Volume 1 - Chapter 1: "The War Begins"
*Crystal damselflies - Touko AozakiLord El-Melloi II Case Files Volume 8: case. Grand Roll (Upper) - Chapter 5 Part 5
*Daemon Limbs - Kaie Karyou
*Dark Star - Daybit Sem Void Fate/Grand Order - Nahui Mictlan: Golden Sea of Trees Travelogue - Section 19: The Cosmic Tree
*Demonic Bees - Odd BorzakFate/Zero Volume 4: Flames of Purgatory - Interlude: Sometime, somewhere
*Demon Gods - Solomon
*Evil Spirits and Demonic Beasts - Orlando ReeveFate/strange Fake Volume 2 - Chapter 3: Day 1, Early Dawn "Ensemble Versus Illusion"
*Doves - SemiramisFate/Apocrypha Volume 1: Apocrypha: Great Holy Grail War - Chapter 2
*Dragon Tooth Warriors - Medea,Fate/stay night - Unlimited Blade Works route - Day 12: moonlight (II) - Betrayal SemiramisFate/Apocrypha Volume 1: Apocrypha: Great Holy Grail War - Prologue
*Dolls - Ainsworth family
*Earthworms - Caules Forvedge YggdmillenniaFate/Apocrypha Volume 2: Round Dance of Black / Festival of Red - Chapter 1
*False Fairies - Misaya Ouji
*Galgen Mainleinn - Serena Sarashina
*Horrors - Gilles de Rais
*Jade birds - Rin Tohsaka,Fate/stay night- Heaven's Feel route - Day 14: servant eater - FoolishFate/stay night [Unlimited Bladeworks] - Episode 12: "The Final Decision" Tokiomi TohsakaFate/Zero Volume 3: The Scattered Ones - Act 12 Part 2 -64:21:13
*Len - Shiki Tohno
*Leysritt - Illyasviel von Einzbern
*Lugh Beowulf - Touko Aozaki
*Nanako - CielMelty Blood Re-ACT - Arcade Mode - Arcueid route 
*MephistophelesFate/Grand Order material I - Mephistopheles, p.314-325. - Georg Faust
*Mini Cu-chan - Connacht ☆ Medb
*Panthers - Caules Forvedge Yggdmillennia
*Ploy Kickshaw - Alice Kuonji
*Projection Machine - Touko AozakiLord El-Melloi II Case Files Volume 3: case. Twin Towers of Iselma (Lower) - Chapter 2 Part 3
*Primate Murder - Altrouge Brunestud (Remake)
*Rat - Waver VelvetFate/Zero Volume 1: The Untold Story of the Fourth Holy Grail War - Act 2 Part 4 -172:38:15
*Ravens - Bersac Blackmore,Lord El-Melloi II Case Files Volume 6: case. Atlas Contract (Upper) - Chapter 1 Part 1 the Blackmore Cemetery creatorLord El-Melloi II Case Files Volume 6: case. Atlas Contract (Upper) - Chapter 2 Part 4
*Projected Gryphon - Amleth Wotan
*Sealed Box - Touko Aozaki
*Shadow Giants - Sakura MatouFate/side side materiale 2
*Shapeshifters - BB
*Snakes - Roland Berzinsky
*Spiders - Jean-Mario SupinerraLord El-Melloi II Case Files Volume 4: case. Mystic Eyes collection train (Upper) - Chapter 4 Part 3
*Storch Ritter - Illyasviel von EinzbernFate/stay night [Unlimited Blade Works] - Episode 3: "The First Battle"
*Stymphalian Birds - Ares
*Tangere - Latio Crudelis Hiram
*The Four Great Daemon Beasts - Merem Solomon
*Trimmau - Reines El-Melloi Archisorte
*Viy - Anastasia Nikolaevna Romanova
*Watcher's Shadows - WatcherFate/strange Fake Volume 5 - Interlude: "Mercenary, Assassin, ________"
*White Len - Aoko Aozaki (Formerly), Shiki Nanaya
*Wire eagle - Irisviel von EinzbernFate/Zero Volume 2: The Mad Feast of Kings - Act 7 Part 1 -130:44:57
*Worms - Kariya Matou, Zouken Matou
===Ghost Liner===
Lord El-Melloi II Case Files Volume 4: case. Mystic Eyes collection train (Upper) - Chapter 3 Part 3Lord El-Melloi II Case Files Volume 5: case. Mystic Eyes collection train (Lower) - Chapter 1 Part 4 is the greatest type of familiar, that is, Servants.Fate/stay night - Fate route - Day 3: long day, long night - Tohsaka Rin (II) Strictly speaking, they are not a familiar and rather fall more on the side of a summoned being. Servants are called familiars only due to some similarities (spiritual connection, dependence on magical energy) and for the sake of formalities. And, unlike familiars, Servants possess free will. They need to be put in a class of their own however, as it would be impossible to summon Heroic Spirits without the help of the Holy Grail and there is no need to use something as powerful as Command Spells to control regular familiars.
"Ghost Liner" is a Clock Tower term, meaning a manifestation of a Heroic Spirit engraved into human history. They are not familiars created by magi themselves, but familiars called forth from the history of humanity itself, so they use the term with the nuance that they are "calling forth a phenomenon that was once recorded." It’s a liner based on the perception that Servants are not living creatures but something more like scrolls and documents.
===Puppets===
 are a special type of familiar that are not any kind of life form, but rather mystic constructs whose actions are controlled (directly or indirectly) by the magus. Their users are known as and follow the philosophy that the magus himself does not need to be strong, but rather he needs to make the strongest creation. They are sentry type familiars akin to Golems, just differently constructed. 
Known Puppet Masters are Touko Aozaki, Cornelius Alba, Van-Fem, Langal, and the unnamed Master of Assassin during the Third Holy Grail War.
===Automata===
===The Dead===
The are the traditional familiars of the Dead Apostles.
They are created in the original Tsukihime continuity when a Vampire's victim who had their blood sucked and then received some of the Vampire's own blood, does not manage to become a Ghoul. 
They are mindless and soulless puppets that are 100% controlled by their creator, so they are not proper members of the Blood-Sucking Species. As such, they can be programmed and manipulated to follow a fixed route or to do other things. 
They deceive death by eating the flesh of their victims, in order to maintain their bodies, but over half of the absorbed energy is sent to their master. They also won't leave a trace when they get destroyed, as their bodies turn into ash. 
In the Tsukihime Remake continuity, The Dead represent the slave caste in vampiric society (Remake). A classification for Ranks I-III of the vampire curse and are seen as "objects", from the sire's point of view. These slaves are completely bound to their sire and return to being corpses when their sire gets destroyed or if the sire doesn't need them anymore.
==References==
vi:Khiển Sứ Linh
Category:Magical tools and artifacts
Category:Magecraft
Category:Terminology in Tsukihime
Category:Terminology in Fate/stay night
*
Category:Magecraft terminology
Category:Terminology in Lord El-Melloi II
Category:Terminology in Tsukihime Remake
Category:Terminology in Fate/Zero
Category:Terminology in Fate/Grand Order
Category:Terminology in Fate/EX
Category:Terminology in Mahoutsukai no Yoru
Category:Terminology in Fate/Apocrypha
Category:Terminology in Fate/strange Fake
Category:Terminology in Fate
Category:Characters by trait
Category:Terminology in Fate/Labyrinth
Category:Terminology in Fate:Lost Einherjar