Name: Ritsuka Fujimaru
Door: Door Pass (submissive)

Canon: Fate/Grand Order
Canon Point: After completing the Sixth Singularity, Camelot

Age: 18
Appearance: link

History: Ritsuka came from a ordinary family and lived an ordinary life, completely oblivious to the society of mages and magic that ran parallel to her world. However, her life changed completely when she chose to donate blood, as it led to her discovery by Chaldea of her incredibly high natural compatibility as a Master, who were in desperate need of people to serve as Master candidates in order to investigate why humanity would no longer exist in a year. Despite knowing nothing about mage society, she was aggressively scouted and sent to the facility in Antarctica as one of the ten civilian candidates; the other thirty-eight were either mages or came from established mage families.

Unfortunately, shortly after arriving, she was promptly kicked off the first mission as she fell asleep during the debriefing. However, this saved her life, as since she was sent away, she wasn't caught in the bomb that went off in the control room, killing or critically injuring all forty-seven other candidates and nearly wiping out the entire chain of command at the facility. Racing into the ruined room to try to find any survivors, the only one she found was a shy girl named Mash Kyrielight who she had met when had first arrived, who laid trapped and crushed under fallen debris. Realizing that her injuries were fatal, Ritsuka chose to stay at the girl's side to provide comfort in her last moments, even if that meant being sealed in with the fire raging through the control room.

But despite the complete loss of staff and personnel in the room, the system that was set up to teleport the team of Master's into the past to investigate remained in operation, and sent the only Master candidate it could locate: Ritsuka Fujimaru. Arriving in Fuyuki City in 2004, she found herself protected by a miraculously recovered Mash - now a Demi-Servant, due to a unknown Heroic Spirit choosing to save her by offering his power to her. They soon met up with a survivor of the era they were sent to, a Caster named Cu Chulainn, who explained to them that the Holy Grail War had become sidetracked, corrupting and warping into something else. With his guidance, they were able to track down the cause of the distortion: a false Holy Grail. There, they discovered that six other Grails had been deliberately distributed through various points of humankind, each of them distorting and unraveling history with contradictions and paradoxes, leading to the modern human age to no longer exist, caused by the event known as the 'Incineration of Humanity'.

With the world outside of Chaldeas no longer existing, the humans in Chaldea were all that was left of modern society, their existence maintained only by the observational powers of the system they run. To reverse the Incineration of Humanity, Ritsuka traveled to various periods of time with Mash to collect the false Grails, teaming up with Servants summoned by the world to try to protect the era to battle with those given the false Grails by the enemy. In France, they fought against Gilles de Rais, who used the grail to bring forth a twisted Jeanne d'Arc as revenge for her execution; in ancient Rome, they fought with the human Emperor Nero to save her empire from the invasion of Roman emperors of old, resurrected as Servants; in Okeanos, they sailed with Francis Drake across a ocean filled ancient myths and legends that no longer existed in the age of man, stopping Jason and the Argonauts from reaching the Ark of the Covenant; in London, they pierced through the mystery of the veil of never-lifting poisonous fog filled with strange machines; in America, fought against an ancient Celtic invasion led by Cu Chulainn and Queen Medb, as Thomas Edison was summoned as the Presi-King of America to fight against the Celtic horde; in Camelot, they arrived to discover that the ancient city of Jerusalem had been turned into a replica of Camelot by a cold and tyrannical King Arthur, going by the title 'the Lion King'.

Emerging victorious each time, even as the challenges and obstacles grow more and more the further they travel into the past, with the collection of the Grail from Camelot, the last Grail Ritsuka needs to collect is from ancient Babylonia, the heart of all human civilization. Unfortunately, it takes some time for them to set up the coordinates with the distortion and warped history creating interference; as of now, the only thing the last Master of Chaldea can do is wait.
Personality:

Friendly: Ritsuka is a rather amicable and broad-minded person, who's able to get along with all of the Servants she summons, having been described in official materials as "remarkably lacking in biases and prejudices". She treats all that she summons well, even if a previous incarnation had tried to kill her beforehand, and is kind to those who are obviously evil or known to be wicked or deviant in their past life. This can be reflected in her friendships with Servants like Ibaraki Dōji or Blackbeard, both who she encountered as enemies in the past and were respectively feared as a bloodthirsty oni and pirate in their legends. However, once summoned to Chaldea, she holds no hard feelings and approaches them as if they were any other Heroic Spirit summoned as a Servant.

Positive: This is one of the key elements of her personality, as even when faced with the Incineration of Humanity and being pretty much the only and last chance to reverse that fate, she never despairs. Not much can get seemingly Ritsuka down even when things seem dire (or at least she tries not to show it) remains optimistic, refusing to give up. While comforting Mash as she lay dying from being crushed by debris, she told the girl a little about the outside world and what it was like, and promised to take her to see the blue sky, since Mash had never been outside of Chaldea in her life.

Adaptable: Since arriving at Chaldea, Ritsuka never knows what to expect and has been proven herself extremely versatile and flexible in adapting to sudden changes. Whether it's traversing through an underground prison with the Count of Monte Cristo while facing personification of the seven deadly sins through Servants she knows, or suddenly finding herself flung into a separate singularity and becoming the disciple under Xuanzang to replace the missing Sun Wukong. With everything that's thrown at her, Ritsuka's managed to survive by adjusting and adapting to the situation around her, no matter how bizarre it may be.

Easy-going: One thing can be said about Ritsuka is that she doesn't try to cage her Servants in formality, holding close, casual relationship with all of them. Even if one was a king in a past life, she addresses them as she would with any other. For instance, when meeting Marie Antoinette summoned as a Servant in New Orleans, she greeted her with "Whassap, my homie" much to the delight of the French queen and repeated the greeting. She's also quite comfortable with teasing and poking fun with her Servants, although sometimes she takes it too far, forgetting that they don't exist at a the same level of modern humans and that some of them have a very different mindset. Unfortunately she can be almost too easy-going at times, and has gotten herself swept up several Servants' wild and crazy schemes when she was unable to escape their pace.

Insecure: Ritsuka is very much aware that she was not the first choice for hero, and that she's woefully lacking in comparison to the other Master candidates. She knows that she's a mediocre magus at best, and her intelligence and strength are average for a girl her age, nor does she have any extraordinary skills and talents. During the Moonlight/Lostroom OVA, the (male) Ritsuka confesses the helplessness he felt when watching France being ravaged by dragons, unable to do anything to stop it, and the frustration he holds at himself being powerless to save anyone. It's safe to say Ritsuka feels the same, as aside from the gender, there is no difference in either of their scenarios.

Reckless: While pretty easy-going as mentioned before, Ritsuka also possesses a strong sense to stubbornly do what's right, which can lead to her being reckless and endangering herself. One noticeable example of that is during Camelot, when they had joined with a group of refugees seeking asylum from King Arthur in order to scout the enemy. However, once the knights began executing the group, she disregarded orders to withdraw discreetly. Instead, she charged in with Mash to save a young boy while also providing a opening for the refugees to flee, instead of being entirely massacred. Another example is when she dove into the control room after it was bombed and everything was on fire, or how she refused to leave Mash's side even though it was clear the other girl wasn't going to make it; her recklessness is very much tied to sense of wanting to do what's right instead of doing what's logical.

Ignorant: While she is by no means dumb, she is woefully uneducated in mythology and many of the basics of magecraft and mage society. Many, many times she requires a crash course in mythology, history, or a explanation of why they're doing things a certain way when they arrive at their destination. In fact when she first arrived at Chaldea, she had no clue what Servants were or real idea on what she was doing, and her introduction to them was through firsthand experience in her first singularity. She's very much the person who doesn't ask too many questions before agreeing to do a favor.

Powers and Abilities: The strongest power Ritsuka has is her high innate compatibility as a Master; it's the reason why she's able to summon so many Servants through Chaldea's summoning system. However, aside from that, her own personal powers as a mage is still relatively weak, and she can only cast spells with the aid of clothing known as Mystic Codes. While wearing the standard Chaldea uniform, she can cast the following three spells:

First Aid: A healing spell that she can cast on one person.
Momentary Reinforcement: Temporarily increase the strength of one person.
Emergency Evasion: Temporarily raise the agility of one person so that they can completely dodge and avoid any attacks.

However, she's not able to use these skills in rapid succession, as there is a cooldown period before she can use the skills again. The more she uses and becomes more experienced with her Mystic Code, the more powerful her spells become and the faster she's able to recharge them.

Lastly, she has three Command Spells on the back of her hand that she can use on Servants contracted with her. While normally Masters in a normal Holy Grail War are only allowed a total of three commands and no more, thanks to Chaldea's unique system, her Command Spells will slowly and gradually recharge over time once they're used. Even if she uses all three of her Command Spells, she doesn't lose her status as a Master or the connection with her Servants, but she needs to wait several days for it to recharge completely.