|“||I'll always love you. But I become different person when I pilot the Psyco Gundam. The inside on my head becomes blank. . . and a different "me" takes over. That why. . .?!||„|
|~ Four to Kamille about herself when she become Psyco gundam pilot and when she become a normal girl.|
Due the effect from modification to made her become "Cyber-newtype" and erase her memories, Four is known very unstable and has fits of insanity that drives her to kill everyone with the Psyco Gundam. She also doesn't like someone who call her "Number 4" , tell about her past or someone tell anything about memory toward her. But strangely, she openly tell about this to Kamille Bidan at their date, who she at the first time join at opposite side.
Beside this, Four actually a kind girl, who wanted to get her memory back and become full-fledged normal person than a killer machine. She admitted to Kamille that she can feel become a "different person" whenever she piloting a Psyco Gundam without any memories. After meeting with Kamille, they are become a lover and always wanted to with him. At the end, she decide to go with Kamille before she unable to forced against him due her brainwashed by the Titans, and ultimately sacrificed herself to protect him from Jerid Messa attack, and die on his arm.
After the One Year War, the young girl who would become Four Murasame lost her family, and after spending an unspecified time as a war orphan she was adopted by the Murasame Research Lab. It was there were the Federation used and trained her to become an artificial Newtype (or "Cyber - Newtype"). The scientist in charge of the project erased all her memories from her previous life and just gave her number 'Four' as the name. Namika Cornell, the nurse in charge of her, convinced her that working with the Titans and fighting the AEUG was the only way that she had to recover her memories. Not only that, but despite obtaining huge psychic powers and mecha piloting skills, she also suffers enough brain damage to sustain very painful headaches that can only be eased by powerful medication.
After escaping from Kennedy Space Center, Karaba's flagship, the Audhumla reached New Hong Kong for supplies. It was in this place where she went for a stroll despite her orders and met AEUG pilot Kamille Bidan.She is introduce herself to Ben Wooder, her new captain and given a mission to hunt Gundam Mk-II with her Psyco Gundam. However, the mission is run quickly and she decide to retreat due Four become sick and ended being scold by Captain Wooder. Angered, Four decide to leave Audhumia and go to Hong Kong by herself, causing Namicar get angry with her and Namicar along with Captain Wooder decide to find her
In Hong Kong, she finally meet face-to-face with Kamille Bidan. Not knowing that Kamille was an enemy, she felt bonded to him, since he is the first person who ever regarded Four as a person in her own right, not as a girl without memories who is bound to become a living weapon. After Kamille tends to her when she has a seizure due to her enhancements, they spend the afternoon together and even share a kiss.
It is only after the truth regarding Kamille is revealed to Four that she chose to pilot the giant Psyco Gundam and attack both Kamille and the city; her desire of getting her memories back and become a full-fledged person are more important than anything. Kamille desperately tries to calm her down and make her join the AEUG, to no real avail; she does calm down when he speaks to her, but cannot bring herself to defect.
After the battle, Four helped Kamille and his Gundam Mk-II back out into space. During this events the Psyco Gundam is severely damaged and Four is presumable killed in an explosion.
However, it was later revealed that Four and the Psyco Gundam survived and were taken to the Titans' Kilimanjaro base in Africa. Once there, the Psyco Gundam was repaired and equipped with an experimental new "psyco-control chair", further enhancing Four's abilities to control the Psyco Gundam. Furthermore, the unfortunate Four was forced once again to undergo medical experiments in order to increase her powers, almost losing her memories of Kamille.
At the beginning of November, U.C. 0087, the AEUG and Karaba launched an attack on the Titans base at Mount Kilimanjaro in Africa. Led by Amuro Ray, they were also supported by Kamille Bidan and Quattro Bajeena. It was then that Kamille discovers that Four was still alive. Four finally remembers Kamille when, after catching a glimpse of her, he infiltrates the Titans base to try saving her again, despite the warnings of Amuro about how they would be forced to fight each other. Four was glad to see him, but the backlash coming from her treatment as well as her own mental instability were a huge hindrance; again she was under heavy headaches, and her brainwashing turned her against Kamille.
In the end, Four was forced once again to fight against Kamille in the Psyco Gundam. She eventually sacrificed herself to save Kamille from a surprise attack from Jerid Messa, dying in Kamille's arms of the injuries she sustained. In her last words, Four comforts the grieving Kamille via saying that she's finally free from her horrible life, asking him to not grieve for her and promising to watch over him.
During the final battle against the Titans, the spirits of Four, Emma, Rosamia, Sara and Katz appears to help Kamille defeating Scirocco.
Later on, she appears as one of the spirits protecting Judau Ashta from Haman Karn in Gundam ZZ.
|“||were you sent here to make my life a misery?||„|
|~ Four Murasame|
|“||So much for a mobile suit. So much for the Mark II. Its nothing but a joke, its a toy.||„|
|~ Four Murasame|
|“||Freeze, intruder! I'll shoot if you move! Bang~ (Playful laugh at Kamille)||„|
|~ Four welcomed Kamille with prank at him|
|“||If you bully Kamille, I won't forgive you !||„|
|~ Four threaten Jerid before runaway with Kamille.|
|“||I'm "Four" because i was the fourth subject at my laboratory. Number Four.||„|
|~ Four tell to Kamille why her name is "Four".|
|“||Kamille, don't feel sad. This way, i can meet you anytime. Because now, I can truly live inside of you||„|
|~ Four last words to Kamille.|
- It is interesting to note that a number of video games actually do allow Four to survive the events that lead to her death. Interestingly, a few of those games, including Super Robot Wars 3, Super Robot Wars Alpha and Gundam vs. Zeta Gundam allow Four to use her Cyber-Newtype powers to calm down and save Kamille when Scirocco attempts to destroy his mind.
- Although Four can be saved in many Super Robot Wars series, the Psyco Gundam can not be obtained. Thus, she does not have a default unit. Usually she will automatically designated to a vacant unit (such as the MSF-007 Gundam Mk-III in Super Robot Wars R).
- Four won Animage's Anime Grand Prix Award in 1985 in the category of favorite female anime character of the year.
- In Episode 36, the intro of Zeta Gundam accidentally colored Four's hair purple and shirt teal, an inverse of what colors she actually wears.