Yandere Dev put a video about rivals in Yandere Simulator three weeks ago but I thought that I can give you some information. İf you want to watch that video I will give the link. There are 10 rivals you may know some of them in the debug build. Lets start!
1) Osana Najimi:
She is one of the base rival. She is tsundere(who can be sometimes really mean but sometimes realy sweet) and very weak.You can read at the begining of the game İnfo-Chan and Yandere-Chan’s (Ayano) conversation about Osana. Basicly there is a faith that if you confess your love to someone under the Sakura Tree he/she will accept your feelings. Senpai (Taro) believes that too. On friday Osana will try to confess her feelings. Osana can be added to game in games files. I am not sure how can you do but I know you can do with files. You can search and watch some videos about that.
2) Amai Odayaka:
She is in the cooking club. She loves baking for Senpai.
3) Kizana Sunobu:
She looks like Kokona Haruka but she has two roses in her hair. She is in drama club.
4) Oka Ruto:
Oka is one of my favourite character in the game. She is president of the occult club, loner and incapable of self defense. She is intrested in paranormal things. She always stalks Basu sisters to find evidence that they are supernatural.
5) Asu Rito:
She is in sports club and she is active.
6) Muja Kina:
She is the school nurse! When I first learned that the nurse is one of the rivals I thought that ‘He is not handsome enough how can everyone love him?! Even a nurse!!’ She is very clumsy.
7) Mida Rana:
I don’t know what to say… She is a TEACHER!
8) Osoro Shidesu:
Yey! She is a deliquent rival! She is strong and rude.
9) Hanako Yamada:
She is Senpai’s (Taro) little sister. She is so cute and jealous. She loves her big brother so much so she thinks that if he had a girlfriend he will forget Hanako.
10) Megami Saiko:
She is the school president and she wants Senpai (Taro) to be safe.