Self-Modification

is the aptitude to remold one's own body or merge one's own flesh with body parts of others. The higher the ranking in this Skill, the further away one is from being a proper hero.Fate/EXTRA materialFate/complete material III
Rank	User(s)
EX 	BB
EX 	Within the Mooncell's AI, there's a cardinal rule that forbids the improvement of one's functions.
But BB escaped such constraints after she broke down, and began expanding her own functions. To upgrade her calculatory abilities, she used her black static to capture and analyze NPCs, AIs, and even Servants and used them to expand her memory. Ignoring the risk of self-destruction, she expanded by adding more and more to herself. As a result, BB turned into an ultra-grade AI with an expansive volume. She is like a city built on a landfill that continues to add buildings even while sinking into the sea, or perhaps Frankenstein's monster.
EX 	Tiamat
EX 	Beast II is able to modify her Saint Graph by use of the Black Mud of the Sea of Life. Growing from the scale of her standard Saint Graph (Femme Fatale), Beast II can assume the form of a Draconic creature of over 60 meters in length. In this form, Beast II obtains immunity against any attacks lower than a Rank of A++.Fate/Grand Order material IV — Profile of Tiamat, translated by Clyton at Beast's Lair.
EX 	Jeanne d'Arc (Alter)
EX 	A special grade remodeling done by the Holy Grail. It has completely inverted the Saint and has made her fall into the Chaotic Evil alignment.Fate/Grand Order material III — Profile of Jeanne d'Arc (Alter), translated by Kinalvin at Reddit.
EX 	BB (Swimsuit)
EX 	A skill to remodify oneself possessed by the original BB, it seems this time, it was used due to unintended circumstances. At the resort of end of the world, prepare yourselves, the recipients named "Human". Somehow, tonight, the celestial bodies are explicitly aligned.Fate/Grand Order material VII — Profile of BB (Swimsuit), translated by Konchew at Reddit.
A 	Nursery Rhyme
A 	"But it do-do-doesn't matter doesn't matter that kind of stuff doesn't matter at all!Whatever you say needs to be done I will do as you order me to!"
C 	Hassan of the Cursed Arm
C 	Hassan, whose abilities are below that of other Servants, uses Self-Modification to enhance his physical performance and make up for his deficits. He is able to seize another person's heart and introduce it to his own body. It's possible to fuse the arm of Shaytān with his own right arm thanks to this Skill.
D 	Henry Jekyll and Hyde (Assassin)
D 	This Skill only manifests when Jekyll transforms into Hyde. Modifies the body to be specialized toward combat. Limited by the Assassin class, the Skill's rank is fairly low and thus its effect is weak to the point it might not even reach the point of extending the length of his arms and legs slightly. If he were to be summoned in the Berserker class, the cumulative effect of this Skill with Mad Enhancement would no doubt turn him into a beast that hardly resembled a human.Fate/Grand Order material III — Profile of Henry Jekyll & Hyde (Assassin), translated by Kinalvin at Reddit.
? 	Henry Jekyll and Hyde (Berserker)
? 	No information available
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