Fou

, more commonly known as , is a figure mentioned in the legends of King Arthur. Previously kept by Merlin, Fou joins with Chaldea Security Organization in the World of Fate/Grand Order. As a juvenile , he possesses the capacity to grow into an adult Beast in Fate Worlds. In Tsukihime Worlds, he is known as Primate Murder.
==Profile==
===Background===
Cath Palug is a member of a species of organism known as who presides over the , the act of envying others' strength and regretting one's own weaknesses.
Originally a Beast of the Planet that became Merlin's familiar, Cath Palug was at some point subsequent to Merlin's sealing driven from the Isle of Avalon. In those worlds where the Common Sense of Man is insufficiently prominent, he came eventually to be known as Primate Murder—the pet of Altrouge Brunestud.
In the timeline of Fate/Grand Order, he came to reside within the Chaldea Security Organization, journeying across the assorted eras of human history in the company of Ritsuka Fujimaru and Mash Kyrielight.
Cath Palug describes himself as that bears the of —growing unto maturation by the conflict that arises amongst Men, feeding upon their and .
Cath Palug is an entity of the Beast class, holding the title of .
===Appearance===
Mash Kyrielight describes the Cath Palug as a squirrel-like creatureFate/Grand Order - Fuyuki: Contaminated City in Flames - Prologue -- "a cute animal," according to his official profile. However, he states that if he were let to normally mature, he would eventually degenerate into an "unsightly monstrosity." in the first Opening and status up cards depict him as having horns in purple and pink colors that adds more colors and grow in size as the rarities go up, a possible hint at his identity as a beast of man. The tail design is also different, having multiple colors instead of being just white. Lancelot and Gawain compare Cath Palug to Barghest's demonic hound form.Fate/Grand Order: Cosmos in the Lostbelt - Avalon le Fae: Fae Round Table Domain - Section 29: A Certain Prophecy
===Personality===
Removed of the Civilization of Man, Cath Palug would be nothing more than a harmless animal.
He considers Merlin to be a "loathsome wretch," claiming that the man forced him from comfort of the in Avalon against his will. As such, he frequently attacks Merlin on sight. However, some of his former masters perversion may have rubbed off on him as he has demonstrated making some suggestive remarks on Mash Kyrielight.
==Role==
===Garden of Avalon===
While Merlin was imprisoned within the Garden of Avalon, he went through the drafts and sketches he had made in life and started telling Cath Palug the events of the life of King Arthur.Garden of Avalon - Chapter 00: At the Garden
Upon witnessing Arthur's final moments, Merlin releases Cath Palug from the Garden of Avalon, insisting that he seek out "that which is beautiful."Garden of Avalon - Chapter 06: In the Flower Garden
===Fate/Grand Order===
Cath Palug is found by the Chaldea Security Organization and given the nickname of . During his stay with the organization, he is permitted to freely wander their facilities.
====Fuyuki: Flame Contaminated City====
Cath Palug is met by Ritsuka Fujimaru alongside Mash Kyrielight.
====E Pluribus Unum: North American Myth War====
Merlin uses Cath Palug as a conduit through which to temporarily reveal himself, so as to lend aid to the protagonists in the battle against Cú Chulainn Alter.Fate/Grand Order - E Pluribus Unum: The Grand Battle of Legends in North America - Section 19: North American Myth War (Beginning)
====Babylonia: Absolute Demonic Front====
Deathofmerlin.gif|Cath Palug attacks Merlin
Fouvsishtar.gif|Cath Palug smacks Ishtar
Cath Palug is present there, interacting with Merlin and the others, with even his identity as a Beast being revealed by Ishtar/Ereshkigal.
====Solomon: The Grand Temple of Time====
In the aftermath of Mash Kyrielight's sacrifice, Cath Palug locates her soul in the place beyond life—revealing his true name and his nature as a Beast. He then expends the majority of the Magical Energy that he's collected across the centuries of his life to transplant his Force of Providence into Mash's soul, perfectly resurrecting her. However, the act deprives him of both his and , leaving him as nothing more than a common animal. In the end, he congratulates Mash and the people of Chaldea for defeating the Beast IV without violence.
====Subspecies Singularity I: Shinjuku====
Despite losing his Sapience and Characteristic in order to resurrect Mash Kyrielight, Fou was able to communicate with Cavall II during the formulation of the plan to defeat Hessian Lobo. Furthermore, he was then able to communicate this information to Mash, despite her lacking the Animal Communication Skill.Fate/Grand Order: Epic of Remnant - Shinjuku: Malignant Quarantined Demonic Realm, Chapter 14: Nostalgia Homesick
====Avalon le Fae: Fae Round Table Domain====
Unlike all previous Singularities and Lostbelts, Fou strangely chooses to stay behind at Chaldea rather than travel to the English Lostbelt.
Merlin briefly transforms into Fou to guide Artoria, Fujimaru, Mash, and Muramasa through the Spiritual Tomb of Albion on their way to Avalon.
====Nahui Mictlan: Golden Sea of Trees Travelogue====
While Fou travels to the South American Lostbelt with everyone else, he up and disappears at some point after Chaldea arrives. Koyanskaya of Light assumes that the reason for Fou's disappearance is because he doesn't want to get involved with ORT.Fate/Grand Order: Cosmos in the Lostbelt - Nahui Mictlan: Golden Sea of Trees Travelogue - Section 7: Guns, Wars, Losses
==Abilities==
Under certain circumstances, Cath Palug is capable of enacting a miracle that exceeds the scope of Magic -- . More specifically, he was able to resuscitate Mash Kyrielight, but this was possible only due to the extra-temporal nature of the context of her death, the interior of Ars Paulina. So to facilitate the process, Cath Palug consumed the majority of the Magical Energy he had accumulated across the centuries of his lifetime, using it to fuel the transference of his Force of Providence to Mash, and overwriting the limitations of her remaining lifespan (3 days). However, as he wasn't yet an adult of his species, he was capable only of granting Mash a lifespan comparable to that of a normal human—at the cost of his own and his as a Beast of Calamity. He has since been witnessed communicating in snippets of human language even after this, however, so it is unclear as to how much of his intelligence was actually sacrificed. 
Fou's ability of "Comparison" lets him feed off the competition and growth of Humans and their negative feelings toward it, allowing him to become stronger than his opponents.
Cathpower.gif|Fou transforming to free Ana.
Fou freeing Ana.gif|Fou freeing Ana from the Chains of Heaven.
He has even demonstrated the ability to escape the Chains of HeavenFate/Grand Order - Babylonia: Absolute Demonic Front - Section 9: The Mother of Demonic Beasts or enter inside Nega-Genesis to aid Ritsuka by teleporting him right above Tiamat's weak spot, even though it can instantly destroy Servants by denying all established forms of life. In the epilogue of Tunguska Special Territory, he's able to sense U-Olga Marie's presence above the Wandering Sea before even Chaldea's super computer Trismegistus II.Fate/Grand Order: Cosmos in the Lostbelt - Tunguska Sanctuary: Anti-Primate Ecosphere - Epilogue
==Development==
Fou was illustrated by Taiki in Fate/Grand Order.
==References==
vi:Beast IV
Category:Felines
Category:Canines
Category:Chaldea Security Organization
Category:Characters in Fate/Grand Order (Chaldea)
Category:Evils of Man
Category:Magical Beasts
Category:Nature Spirits
Category:Familiars
Category:English historical and mythological figures
Category:Characters in Garden of Avalon
Category:Introduced in 2015
Category:Voice - Ayako Kawasumi
Category:Counter Force
Category:Enemies of King Arthur