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Chiyo Chishu(Usually known as 'Chiyo Casella' outside of the Yandere Simulator universe) is a multi-fandom OC made by Kamiko

Theme song

Check out this page to see Chiyo in the Reverse AU


Chiyo has fair skin. She wears light pink lip gloss. She has brown hair with a dyed dark blue streak. She also wears it in a ponytail so her hair wont blow all over her face when exercising. Chiyo's height is shorter than an average 1st year student, being only 5'1 ft. She wears goggles on top of her head as it's required for members of the Sports club. Chiyo will automatically wear the seifuku unless the uniform is changed by the player. Her stockings are blue with pink stripes. Chiyo also wears plain blue panties. Chiyo also has black eyes just like her sisters.


Chiyo looks the same except she wears the 1st year female uniform 


Chiyo is tough and hot headed, but she is caring. She is very active in sports and shows irritation when she's around lazy people. She often shows a tough act towards everybody, even towards her friends. Her reputation used to be this 20% below average, but has slightly gotten better because she started to control her anger. Her reputation is still below average though, being -10, due to her tough act scaring some students. She dislikes hurting people, but if they annoy her too much, she will slap them. She will only become more dangerous if they start to attack her. She claims that she doesn't need anybody's help, however, she becomes sad when she's alone. This trait obviously makes her a tsundere, a person who tries to hide their true feelings by acting tough and aggressive towards their lover.

Reaction to Suspisious Actions

Chiyo's strength is Very Strong

Chiyo's actions will depend on the atmosphere of the school.

Bloody Clothing- Chiyo will confront you, asking you what the stain is.. Med-Low atmosphere Chiyo will gossip about you.

Suspicious Weapons- Chiyo will question you.(High atmosphere) Gossip about you(Med - Low atmosphere)

Evil Laughing- Chiyo will tell you to shut up.

Medium or Low Sanity- Chiyo will just avoid you.

Blood on Ground- Chiyo will just think it's ketchup and ignore it unless it's low atmosphere(she will tell her friends about it and call the police).

Reaction to Murder

Chiyo will react upon the Heroic persona.

Acquaintances- Heroic student reaction

Friends or/and Crush- Heroic reaction.

Enemies- Heroic reaction.

Reaction to getting pointed at by a camera

Chiyo will hide her face like an evil student despite being Heroic.


Sometimes her schedule will be altered such as going to the bathroom.

  1. Enter School and change shoes
  2. Chat with her best friends
  3. Head to class 1-1 and stay there until Lunch
  4. Chat with best friends
  5. Head to class 1-1 and stay there until school is over
  6. Change shoes and heads to the track field(Unless if the club disbands she will just head home)
  7. Participate in club activity
  8. Go home


KAwAIiDaSuNeCHaN!1!- Chiyo is very rude to her and calls her a "lame ass no good Mary Sue". (mostly because she harrasses Steven a lot)

Seishirō Morita

She's friends with him. She acts very tsundere-ish towards him whenever he teases her.

If you kill him in front of Chiyo, she will try to kill you.

Otsune Chishu

Chiyo's older sibling. Chiyo gets irritated whenever Otsune teases her about Chiyo's "tough" act. However Chiyo cares for them. Chiyo trusts them the most out of her family. Chiyo also sometimes forgets to use male pronouns when mentioning them at school.

If you kill them in front of Chiyo, she will apprehend you.

Mia Casella- Chiyo's younger sister. Chiyo gets a bit annoyed when Mia follows her around almost everyday. Chiyo is unaware about Mia's huge respect for her. Chiyo does care for her as Chiyo wouldn't mind helping her out when Mia is upset.

Sue Casella- Chiyo's younger sister. Chiyo tries to avoid her as things get heated whenever they're near each other. Chiyo shows...some care for her. They used to be close, until an argument happened between them 2 years ago. Chiyo is aware of Sue's mean nature.

Zakku Wakiya

They argue a lot, mostly because she wants him to be more active but he always refuses. They are sort of friends.

One day during a disagreement about exercising she took his sketchbook so she can try to get him to do more things other than drawing. If Zack gets his sketchbook back from her she wont take it away from him again. 

Megami Saikou

Chiyo used to dislike her because she used to be constantly getting watched and sent to detention by her.


  • She is the second oldest sibling in her family being after, Otsune Chishu.
  • Despite being a tsundere, Chiyo doesn't know what a tsundere is.
  • Chiyo has gotten in trouble for fighting with other students before. She even got suspended for a week for knocking out a student.
  • Blue is Chiyo's favorite color.
  • She's has the most appearance and personality changes changes of all of Kamiko's OCs

100 Questions

Chiyo Casella/100 Questions


TONS of outdated images!

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