Tenkousei-kun
-Anzu's step-brother who is a year younger than her.
-Protagonist of Ensemble Girls
-Former Yumenosaki student who was in the general course.
For more info about him in Enstars, check: First Shrine Visit, Devils, and Tsukasa's Sub Story 1

Chizuru Yakumo
-Narrator of the story "Crosstalk."
-One of the four main members of the Kimisaki Rebellion, including Anzu, Suzu, and Yako. Also known as the "問題児 (problem children/troublemakers)"
-Has a verbal tic of "～かなって," which gets translated to "I guess" in "Paradise", an Anzu/Kimisaki Rebellion centric story.

Yako Konan
-Leader of the Kimisaki Rebellion, including Anzu, Suzu, and Chizuru. Also known as the "問題児 (problem children/troublemakers)"
-Often speaks in spanish, but does get it wrong. Such as in "Paradise", when she says "Yo puedo volar" thinking it means "I will fly into the sky," but it actually means "I can fly."

Suzu Kuromori
-One of the most-mentioned characters in Ensemble Stars.
-Anzu's best friend from Kimisaki, they were so close that people often thought they were dating.
-Often connected to Mika Kagehira, due to their black-hair (often colored as purple&green due to their connections to ravens+crows,) heterochromia, and Suzu having a similar personality to Mika in her first year. Both Anzu and Chizuru have connected them to eachother, with Mika even saying himself that she's his long-lost sister.

Seira Sone
-The leader of the rock-band club, aka Suzu's band.
-Mika mentions meeting Suzu's bandmates in Milky Way, and considering he said this in his second year, Seira could have been the only one he met out of the current lineup of four.
-Always in and out of the hospital, and as a result of all her families money going towards her health, she often eats flowers.

Ruri Amamiya
-The "Alien" Leo Tsukinaga often mentions meeting.
-Told Leo the proper alien greeting "Daiuchuu," which Leo shortened down to "Uchuu."

Ruka Tsukinaga
-A member of the Rock Music club, along with Seira and Suzu.
-Leo Tsukinaga's sister, often mentioning that he's in college and that he drives her to all the band's meetings. This 1. confirms that Engirls takes place a year after es! 2. gives us the first information about how he can drive.

Reika Enjouji
-The student council president at the time Anzu attended Kimisaki.
-A member of the tea club, a club Anzu was a part of.
-She resembles Eichi Tenshouin, which was a reason why Anzu refused Eichi's invite to join the tea club.

Sakura Itoh
-Class representative in Anzu's first year.
-A huge reason Anzu got expelled from Kimisaki.
-According to Anzu, she acted a lot like Keito, which caused Anzu to be afraid of him for a while.

(Be aware, next characters have a mention of the Shinkai cult)

Hajime & Ichika Kodama
-Family owns a shrine, which is shown in First Shine Visit and First Dreams 2
-Hajime is the "friend" Anzu says she is helping out in First Shrine visit.
-Its suggested that their ancestors have connections to Kanata's ancestors and the Shinkai cult.

Yae Nagamachi
-A current first year (es!! timeline)/underclassmen of tenkousei-kun.
-She doesn't have any impact on the Enstars story, but she does give us the fact that Anzu can drive in one of her minitalks

(be aware, this substory does have mentions of abuse, scars, running away, and bruises.)

congrats you made it to the end :]