

Introduction
Mysterious Heroine XX is a 4-star servant in Fate/Grand Order with the Star attribute. Mysterious Heroine XX's class is Foreigner.
On our Fate/Grand Order tier list Mysterious Heroine XX is B tier, 107th of the 366 servants ranked, from where 6 current tier lists put Mysterious Heroine XX.
Other servants in Fate/Grand Order with the Star attribute: Altria Caster, Altria Caster (Berserker), Archetype Earth, Attila the San(ta), BB Dubai, Bedivere and 20 more.
Profile
Mysterious Heroine XX is voiced by Ayako Kawasumi in Japanese.
Background
"Foreigner detected. Must. Annihilate. "
Stories
7Character details
A single shooting star that arrived to destroy the Servant Festival.
She is the voice of Space Law, and a merciless Machine Servant tasked with obliterating all of Earth's humans and Foreigners.
And when her unexpected identity is finally revealed, rumor is that the shock may overwhelm everyone!
Profile 1
Height/Weight: 154cm, 48kg
Origin: The Cosmo Guardian Trilogy
Region: The Servant Universe
Alignment: Lawful-Good
Sub-Attribute: Star
Gender: Female
*Height and weight changes every time she suits up or purges her armor.
"My weight is just high because of my work stress. I'll get back to my original 42kg real quick!"
Profile 2
『Etherspace, Yet Lawful』
Rank: EX
NP Type: Anti-Personnel
Range: 9 - 99
The Servant Universe Is the Cosmos.
Depending on her mood, she will shout either "Twinmyniad Disaster" or "Double X Dynamic," but this Noble Phantasm's True Name is "Etherspace, Yet Lawful." The True Name represents and mirrors the Rhongomyniad that protects the laws of space. The Rhongomyniad LR's safety limiters are removed, and it devastates Sabers by increasing its output. It'll blow its target up, planet and all.
She rejects the notion of a right to remain silent or a right to an attorney, because she is the voice of judgment. This is a useful Noble Phantasm that is not only a Special Attack against Foreigners, but also against Sabers.
Profile 3
『Nameless Nebula Sword, Secretmyniad』
Rank: EX
NP Type: Anti-Army
Range: 9 - 99
A galaxy nebula slicer that uses Rhongomyniad LR, a weapon said to be space's balancing scales. Swinging the spear around radiates light like a swirling nebula, which mows down all around it, friend or foe. This doesn't really get used in FGO.
Justice of World's End: A
Power from the boundary, the most advanced and furthermost area of space. It tears away at nothingness, and is the true principle behind expanding space. It offers all but unlimited power, able even to repel even higher beings from outside the universe in order to restore balance to the universe. XX...doesn't really understand how it works.
Profile 4
Suit Up: EX
The protection of the sacred spear armor Aahvalon. The armor constantly exists around XX in the form of spiritrons. With a speed of negative one second (where it can turn back time by one second to activate even if XX is taken by surprise) it protects and arms XX. She calls this little stunt "Suiting Up."
...Don't kid yourself, missy. This is actually an astonishing skill that XX acquired because she habitually overslept and was late for everything, even after joining the Galactic Police. It could actually be called a quick change skill. In fact, there's no real need for it, and it functions as armor in its spiritron state just fine. Arming oneself significantly increases their attack.
Police Instincts: E
Divine revelation used to find culprits. The low rank suggests it's really not so great for solving crimes, though. Various hints to solving crime seem to stem from otherworldly inspiration completely devoid of logic. XX never really notices these hints though. In some cases, this demerit becomes advantageous, actually making this a brilliant skill.
Profile 5
To sum up Mysterious Heroine X in a sentence would probably be simplest by saying that she is the protagonist of a TV comedy. By inheriting Altria's serious demeanor, X focuses on doing everything as quickly and simply as possible. Contrary to her polite and energetic mannerisms, she is extremely competitive (since she's not really aware of this, she is unbelievably dense). She challenged herself to achieve various things, and was absolutely relentless, not giving up until she succeeded. This was a bit problematic, but since she possesses such a virtuous nature, she ended up working to benefit others, so it all worked out okay.
However...
With the Servant Universe full and boiling over with an excess of Extra Classes, the balance between heroes and villains collapsed. The moment the scales of space tilted toward the villains, XX vowed to change her principles... And then the show headed into a new season. As an unemployed X didn't know what to do, she was hired by a secret society, the Galactic Police. In their HQ's center, she stumbles onto the oldest artifact in space, the Rhongomyniad. Her talents are acknowledged, and she becomes active as a Galaxian.
-Story Excerpt from CG Episode I-
Additional profile
When X became a member of the Galactic Police, she saw this as a good opportunity and changed her name and registration to XX. As she gained a new identity, she was able to abandon all her past debts, and she established Special Investigation Division O that cracked down on Foreigners, the invaders from outside space. And so was born XX, huntress of the wicked.
Her whole Saber-hunter thing has kind of faded, and now she's a Foreigner-hunter. Still, her desire to eradicate all Sabers hasn't gone away, so she still has her Saber special attacks.
Motivation, Behavior Towards Master:
Partner on Earth. A reliable wallet.
Since X has zero skills and awareness when it comes to romance, Master is more of a friend to her. Eventually, though, she realizes they are someone special.
"What's this sensation I'm feeling in my chest...don't tell me there's a wicked Saber on this planet!?"
Her erroneous thinking leads her to miss her opportunity. She's pretty much the same X, but she's aware that she's an officer, so tries to act more mature. Since she's a few versions later (read: older) than X, she looks like an office worker worn out by the daily grind.
Stats
- HP11,250
- ATK9,751
- Star generation15%
- Star absorption147
- Death rate10%
- NP gain per hit0.64%
- NP gain when hit3%
At level 80. Each bar is measured against the highest value in the Fate/Grand Order roster.
Skills
13Suit Up EX
Skill 1Apply Invincible (1 turn) & increase ATK (1 turn) for yourself ATK Up: 50% Cooldown: 5 turns
At skill level 10
Police Instincts E
Skill 2Gain C. Stars + Decrease C. Star Gather Rate (1 turn) for yourself C. Star Gain: 20 Critical Rate Up: 10% C. Star Gather Down: 100% Critical Rate Up: 10% Cooldown: 4 turns
At skill level 10
Justice of World's End A
Skill 3Apply Ignore Invincible (1 turn) & increase NP Gauge & apply Special Attack [Threat to Humanity] (1 turn) for yourself NP Gain: 30% STR Up vs. Threat to Humanity: 50% Cooldown: 5 turns
At skill level 10
Etherspace, Yet Lawful
Noble PhantasmArts, rank EX, Anti-Personnel. Increase your ATK (1 turn) <effect increases with Overcharge> + Deal significant Special Attack damage to a single [Saber-class Servant] enemy ▲ ATK Up: 20% to 60% by Overcharge Damage: 1200% at NP1, 1800% at NP5
Entity of the Outer Realm D
Class skillGain 2 C. Stars each turn & increase Debuff Resist for yourself
Cosmo Reactor B
Class skillIncrease your C. Star Drop Rate
Independent Action A
Class skillIncrease your Critical Strength
Riding Skill A
Class skillIncrease your Quick Card effectiveness
Extra Attack Boost
Append skill 1Increase Extra Attack Card's effectiveness by 50% for yourself
At skill level 10
Load Magical Energy
Append skill 2Begin battle with NP charged at 20% for yourself
At skill level 10
Anti-Moon Cancer (ATK Up)
Append skill 3Increase ATK against [Moon Cancer] class by 30% for yourself
At skill level 10
Special Attack Boost
Append skill 4Increase Critical Strength by 30% for yourself
At skill level 10
Skill Reload
Append skill 5Apply a state that "reduces skill cooldown by 1 after using it" (1 time <2 times at Lv. 6-9, 3 times at Lv. 10>, goes into effect only 1 time per skill)
At skill level 10



