Rivals

'''Rivals are the main antagonists of Yandere Simulator. In the future, there will be ten rivals for the ten weeks of Story Mode, with one rival appearing each week. They have not been fully implemented yet.'''

They are the most important people to eliminate, as they all have a crush on Senpai. If the rival is not eliminated by the end of the week, they will confess their love to Senpai under The Cherry Tree behind the school on Friday and Yandere-chan will be left heartbroken. A girl confessing to a boy underneath a cherry tree is a cliché in anime that will be drawn upon in the game. Each rival in the game is an anime archetype, inspired by popular concepts and stereotypes. However, not every one of them is based on a "dere" archetype.

In the current debug build, there are no actual NPCs who function like proper rivals, so there is no way to win the game yet. In the full game, they will not be in the school until their week comes. Each rival will be introduced via a cut-scene conversation with Info-chan. The rivals for weeks two to ten will each have a reason for not coming to the school for the previous weeks of the game. They will also have a short cut-scene that shows how they met Senpai and why they are attracted to him. Some of the cut-scenes will be humorous to balance out the other dark elements of the game.

Senpai will not fall in love with girls of his own accord. He will start to develop a crush on a rival if she has five interaction events with him. There will be one "event" with Senpai each day, with the final event being a love confession. It is possible for Yandere-chan to sabotage each event.

Even though the main object of their desire is Senpai, all rivals will have a secondary crush on a male student. This allows the main character to matchmake every rival with their suitor as a way of eliminating them. If the player chooses to make Senpai female, then Yandere-chan and Senpai will be lesbian and all of the rivals will be bisexual.

Every rival will wear special stockings to make themselves stand out and will have unique panties that suit their personality. In the future, rival hairstyles and accessories might be unlocked after beating the game once. YandereDev has considered the idea of allowing the player to dress up as any of the players after eliminating them.

As the game progresses, each rival is more difficult to defeat than the previous one, sometimes because of popularity.

Rivals are seen outlined in red in Yandere Vision, although this outline might have other identifications as traumatized students also have a red aura.

The rivals will never know the player exists or that they have competition for Senpai.

Test Rivals
''These rivals are only for testing and are unlikely to be rivals in the final game. Currently, there have only been two test rivals.''

Rival-chan
Rival-chan uses Osana Najimi's old model, so they are often confused with each other. Rival-chan only exists to test the red rival outline of Yandere Vision and to stand in for Osana.

Victim-chan
Victim-chan was the first test rival. Her looks were meant to resemble the first rival, Osana Najimi. She was eventually removed from the game.

Kokona Haruka
Kokona Haruka is the current test rival. Although she might not be an actual rival in the final game, she is being used to test elimination methods. As shown above, she has a crush on Senpai, so Yandere-chan has a reason to eliminate her - however, eliminating her will not win the game. The player will still lose at the end of the week since she is not programmed in as an "official rival".

Since so much work has been put into her, she may become an official rival. If she does, then she will become the President of the Drama Club and be the third rival of the game.

Story Mode Rivals
'''All rivals have been planned out. They have had official rival designs since October 2015. As of late November 2015, an artist has created full-body illustrations for every rival character. YandereDev has asked for a few modifications, and when those are fulfilled, he will officially reveal all of them. Only Oka Ruto and The Nurse currently exist in the game.'''

Osana Najimi
'''Osana Najimi will be the first rival in the full game. ' NOTE: The character who stands under the cherry tree is "Rival-chan". Osana will be a completely different character.''

Her AI is currently incomplete, so she cannot be interacted with. Because of this, the player cannot beat the game, and you will always lose on Friday at 6:00 PM due to Osana confessing her love to Senpai. She was originally shown to be Senpai's childhood friend and a tsundere.

YandereDev will implement her after he has 5 set interaction events between her and Senpai. At the moment, he cannot create these interactions because he doesn't have an animation rig for Senpai.

In the second intro, her tsundere tendencies and her background as Senpai's childhood best friend are not mentioned in the slightest. However, YandereDev says that her character concept has not changed.

Cooking Club President
The president of the Cooking Club is a planned rival. She is a warm, gentle, kind-hearted girl. She is a "big sister" or "onee-chan" type character.

Drama Club President
The Drama Club President, who will be the third rival in the full game, was always meant to be a purple-haired girl with fancy hair. Kokona might become this rival.

Swim Team Captain
The swim team captain is a planned rival. She will be perpetually positive and energetic, and can be described as a 'Genki Girl'.

Oka Ruto
Oka Ruto will be a rival in the full game, although she does not currently function as one. She is the founder and president of the Occult Club. She is also a cross between the Hex Maniac from Pokemon: X and Y, Tharja from Fire Emblem: Awakening, and Tomoko from WataMote.

Substitute Nurse
A substitute nurse is a planned rival. Her character trait is unintentional sexual innuendos. She is pure and innocent. The official nurse will be on vacation during her week as a rival. She will disappear from the school after her week is over, even if she is eliminated peacefully.

Substitute Teacher
A substitute teacher is also a planned rival. The teacher's trait is intentional sexual innuendoes, and she will be sultry and seductive. She can be called upon by a Teacher's Pet if they discover a corpse or witness a murder. Yandere-chan will be able to matchmake her with a student. She will disappear from the school after her week is over, even if she is eliminated peacefully.

Delinquent Rival
A delinquent is a planned rival. Not much is known about her, other than that she will not be evil.

She is the leader of a gang, and always has her cronies nearby.

Senpai's Sister
Senpai's little sister will be the eighth or ninth rival in the full game. Her appearance has been updated as of November 28th, 2015. She does not lust after her brother, but loves him so much that she does not want him to get a girlfriend. She wants all his attention. She is said to be one year younger than Senpai and two school years behind him.

Student Council President
The Student Council president is a planned rival. She will be a lot like Nayuta from Yumina the Ethereal VN. She will also be a strict disciplinarian.

1980s Mode Rivals

 * Main Article: 1980s Mode

Like Story Mode, there will be ten rivals, with one appearing each week. They will be created out of pre-existing assets instead of original designs.

The rivals in 1980s Mode will have a crush on Yandere-chan's father. This is because the player character of that mode will be the yandere from the Mysterious and Basement Tapes, who is Yandere-chan's mother. Yandere-chan's father is also Yandere-chan's mother's senpai.

Phantom Girl
She is the only known rival at the moment. However, she might be killed in the intro animation of the mode, instead of her elimination being left up to the player.

Endless Mode Rivals
In Endless Mode, the game will randomly generate a rival each week for an unlimited amount of weeks until Yandere-chan gets caught. The player will have to stalk Senpai until they identify the newest rival. They will not have special stockings. They will have the normal functions of a rival, and you will be able to eliminate them the same way as a rival in Story Mode.

Planned Elimination Methods
As of now, only some of the elimination methods are implemented. Kokona is a test rival for all of them. These elimination methods include:

Currently implemented Not currently implemented There will be 15 elimination methods that will work on all 10 rivals. Each rival will also have one unique elimination method that is restricted to only them. In fact, it is possible that in the full game some methods will be tied to scripted events which only involve the rival. The rivals were built around their elimination methods.
 * Drowning
 * Electrocution
 * Poisoning
 * Homicide
 * Kidnapping
 * Fake Suicide
 * Framing
 * Gossip
 * Suicide
 * Murder-suicide due to torture.
 * Dismemberment
 * Matchmaking
 * Snitching
 * Rejection
 * Crushing
 * Friend Elimination
 * A secret peaceful elimination method that has not been revealed yet.
 * Possibly hanging.

Once a rival has been eliminated non-lethally, they become a regular NPC and all "normal NPC interactions" become available to them.

The player will not be able to threaten or intimidate rivals, only directly eliminate them one way or another. Blackmail will not be available either because the game is about taking direct action against your rivals.

Trivia

 * At one point, there was an elimination method that was similar to tampering with the school diving boards so that the rival would smash their face into the ground, but it was criticized for being "too Looney Tunes."
 * In the future, killing a rival early will allow the player to skip forward to the next week.
 * There is an old post detailing all ten of the rivals. Although outdated, some information has persisted and remained in the game's plan, such as Osana Najimi and The Nurse.
 * There is a page that shows most likely outdated designs of a few of the rivals. The artist mentions that they are subject to heavy change, as well. YandereDev linked to the page in older comments on here.
 * A car bomb would be an appropriate way to eliminate one particular rival, but this is not very yandere-like.
 * Certain rivals may be capable of self-defense, but not Osana Najimi, since she is a "tutorial" rival. Some rivals are the type of person who would catch a knife if it was thrown at them, even if their back was turned. The Nurse and substitute teacher, however, are not.
 * Only two rivals will ever directly confront Yandere-chan, and they, including a third rival who can defend herself, will fight in manners completely different from one another.
 * Koharu Hinata had a crush on Senpai in the September 18th, 2015 Build, and was, therefore, a rival. This mistake changed with the October 8th, 2015 Update.
 * All of the rivals will be on good terms with Senpai. If he sees them covered in blood, he will not assume they committed a crime. If one of the rivals is arrested, Senpai will be in disbelief, but he will have no way to overturn the evidence against her and will be powerless to help her.
 * It will be impossible to get rid of one rival to instantly cause the elimination of another.
 * Each rival's birthday will fall on a different month of the year.
 * YandereDev released parody of a popular Christmas song on December 26, 2014, which contained two possible rival names: Miyuki-chan and Sadako-chan.
 * YandereDev later revealed that he only used those names because he thought they were common, generic Japanese names.
 * YandereDev also revealed he wants names that reference who the character is. For example, Senpai's childhood friend is named Osana Najimi because osananajimi (幼なじみ) means "childhood friend" in Japanese.
 * There was originally going to be a short loli rival, but YandereDev is opposed to the idea now because of all the work and problems it would create.
 * If the rivals were in Hogwarts, most of them would be Gryffindor.
 * Only rivals will have dark secrets, not regular NPCs, with the exception of certain characters like The Journalist.
 * Pregnancy might be one of the rivals' dark secret.
 * If the rivals have siblings, they do not attend Akademi High School.
 * Some of the rivals are intended to be likable people who do not deserve to die, possibly making the player feel some guilt for whatever they do to them.
 * YandereDev's current plan as of January 14th, 2016 does not include a rival who Info-chan will refuse to help kill or torture.
 * Implementing the ability to disguise as a rival is very tricky, so it cannot be guaranteed.
 * YandereDev is considering the old idea of taking trophies from rivals, but it is low priority.
 * YandereDev likes the idea of breaking into a rival's home and smashing her possessions, but this would only happen if a small town is added.