Yuno Gasai

Yuno Gasai is the main female protagonist of the Future Diary series. She is the Second in the Survival Game and she is the owner of the "Yukiteru Diary/ Diary of future love".

In the AWA fics, Yuno is a student at the AWA Academy and is part of Class 3.

Appearance
Yuno Gasai is a young girl with pink eyes and long pink hair styled in pigtails, two hanging as frontal locks featuring a pair of red bows, and the back pigtails left bare. Her most common attire consists of a blue shirt with a ribbon on her chest accompanied by a blue skirt with high socks, but her wardrobe changes occasionally throughout the series. When in "Psycho Mode" (what Yukiteru calls it), in the anime, her eyes will change from a normal state to where her pupils enlarge with rings on the inside.

Personality
Yuno's personality is ambiguous. For the most part she is a sweet, feminine, and sometimes shy girl when around Yukiteru. But, this masks her dark and sanguinary side—ruthless, cold and calculating. She has little, if any, problem in using others for her ends: her and Yukiteru's survival. She will resort to cruel and usually violent methods, most of the time coming out of nowhere, that generally end in bloody deaths, of either the Diary Holder or any respective follower, effectively making her a Yandere.

Her brutal personality mostly results from abuse inflicted by her mother and the absence of her father, which finally ended with their deaths two years prior to the Survival Game. This was the beginning of her changes, as she later became quite lonely and sorrowful. This is shown in her somewhat morbid habits of talking to her parents' dead bodies, telling them about her day, and claiming she will bring by Yukiteru. When Aru Akise moved their bodies, she became angry and said her parents were sleeping and that he woke them up. Later she even took their heads with her when she trapped Yukiteru in a hotel.

The point when Yukiteru told her they would marry when they grew up became a pillar of support that gave her much needed stability. Her obsession for Yukiteru grew to escalating proportions to the point that she was willing to harm those whom she believed would take Yukiteru away from her, such as friends, rivals, relatives, other girls, etc. At one point she even kidnapped Yukiteru and held him hostage. Aru Akise stated that Yukiteru provided a stabilizing influence in her normally chaotic and violent life.

Her obsessive love escalates to the point that she was prepared to resort to violence if Yukiteru's mother ever opposed her (which did not happen), stating that she did not "need her tools." Furthermore, she threatened to kill Tsubaki Kasugano, and immediately panicked that Yukiteru's friends Aru Akise, Hinata Hino, Mao Nonosaka, and Ouji Kosaka would take Yukiteru away from her, forcing Yukiteru to calm her down and announce their official "relationship", much to Yuno's joy and his own despair.

Despite her insanity, Yuno has shown some reservedness to killing. This is shown when, after Yukiteru calls her his girlfriend, she instantly lets Hinata go when she intended to slit her throat. The fact that she did this rather than killing her anyway to ensure that there was no chance Yukiteru would fall for her suggests that she doesn't actually enjoy killing; she merely does it because she sees no other option. It is shown many times in the series just how deeply insecure Yuno truly is when she says her life would not be worth living if she could not be the center of Yukiteru's world. Her crippling fear of losing him is notably the only thing that can cause her usually disturbing composure to crack.

In the third world, the Third World Yuno seemed to be very nice and calm, possibly because she still had love for her parents and there was no survival game for them to participate in. This allowed Yuno to stay mentally sane. However, as a side effect of receiving her First World self's memories, it is implied that she might still remember some of the things that occurred in the first world as she states that she feels as if something is missing.

Abilities
Her diary is the Yukiteru Diary, which tells her everything about Yukiteru in intervals of ten minutes. While this means that her diary is basically useless by itself, if combined with Yukiteru's Random Diary that predicts Yukiteru's surroundings, it can cover Yuno's weaknesses and protect Yukiteru, making the two a fearsome duo. Even while the diary does not help her much by itself, Yuno can more than enough make up for it with her cunning intelligence, which has saved both Yukiteru and herself multiple times. She quickly formulates most of the plans the pair use to save themselves from the attacks of the other participants. Yuno is also very proficient at quickly determining the weaknesses of certain diary users, like Yomotsu Hirasaka and his blindness, or discovering that Tsubaki Kasugano's followers were pretending to be dead waiting to ambush them.

She is also skilled in setting traps, for example when she booby-trapped an abandoned hotel with multiple tools, such as electronic locks, concrete (gas in the anime) and even a sickle from an elevator (also in the anime). Her intelligence, her greatest asset, is displayed when she manages to outwit her opponents such as the very formidable Akise.

Yuno is shown to be quite resourceful. For example, she uses a shard of glass as a mirror to check the position of Minene Uryu during her bombing attack and a pair of stones against Yomotsu to root him out among his copycats.

In addition to intelligence and cunning, perhaps her most fearsome ability is demonstrating proficiency with different types of weaponry. These include knives, axes, swords, pistols and submachine guns. She is also fairly knowledgeable of poisons and drugs, although she rarely uses them. She has also demonstrated to be quite skilled in infiltration, as she has on more than one occasion entered a building unnoticed even while it was surrounded by the police.

Despite her feminine appearance, Yuno has demonstrated impressive feats of physical strength, seen when she freed herself from two boys her age pinning her arms down. Another time is when she broke free of two Omekata Cult members when Tsubaki kissed Yukiteru. She killed them too, despite being severely weakened by the excessive amount of physical activity performed at that time, and subsequently chopped off Tsubaki's hand with one strike.

Yuno also possesses divine powers from winning the first Diary Game and inheriting the throne of God. An example of such power is moving enormous structures through her will alone, such as when she tried to crush Yukiteru.

Trivia

 * The characters of her last name mean "I" and "wife", respectively.
 * Yuno's birthday is November 16th.
 * Her first name is based on Juno, the Roman goddess who was wife to Jupiter. Like her namesake, Yuno is extremely jealous of any woman who goes near Yukiteru.
 * Yuno's "Yandere Trance" at the end of Sign Up has become an internet meme, with internet users editing Yuno's face to look like other characters from numerous series.
 * Yuno has three character theme songs: The first is "RED Love " performed by Faylan; the second is "Happy Fate " by Matsui Yousei and sung by Choucho; and third, shared with Yukiteru, is "My Wish Lives in the Future ", sung by Yuno's voice actress Murata Tomosa.
 * It is slightly foreshadowed in both openings that Yuno had killed herself.
 * Yuno in the English dub of the anime calls Yuki affectionate nicknames like "sugarbear, and "sweetie."
 * Yuno was a contestant of the International Saimoe League's 2012 season.
 * While you can not revive a person's soul, MuruMuru still found a way to revive Yuno even after she had seemingly died. She did this by transforming Yuno's body along with her memories into a strange unknown container. After about two years, MuruMuru eventually transferred all of the First Yuno's memories to the Third Yuno, thereby, the original Yuno's life was restored, even after her death.
 * Yuno translates to English as “hot water”, while Gasai translates to “tactics”.