Characters in Seiren. A work in progress.
The male protagonist, Shoichi is a student at Kibito High School who is worried about his future. However, through meeting and forming relationships with his various female schoolmates, he might finally stand to find some direction in his life.
- Babies Ever After: The epilogues of Toru and Kyoko's story arcs end this way, with both of them having a daughter with Shoichi.
- Book Dumb: Implied, as he has Ikuo tutor him in episode 2. His classmates suggest that getting good grades is not a normal occurrence for him. Ultimately downplayed, as he is assigned to a basic class at summer prep school.
- Chekhov's Skill: Episode 6 reveals that Shoichi excelled at a bus driving arcade game. The end of Toru's arc shows that he has taken up a job as a school bus driver for his daughter's kindergarten, where Toru teaches.
- Childhood Friend: With Ikuo, Tatsuya and Kyouko. Kyouko's relationship with Shoichi eventually graduates into a Childhood Friend Romance in her own arc.
- Covert Pervert: He is a healthy, heterosexual teenage boy surrounded by beautiful ladies, several of whom find themselves in suggestive poses, outfits and situations. Of course, he's going to notice.
- Desperately Looking for a Purpose in Life: Shoichi has no clue what he wants to do past graduation, and it's a thought that clearly weighs heavily upon him. His chosen profession varies depending on the arc.
- Expressive Accessory: The rabbit plush Toru gives Shoichi in Episode 7 is this, as its facial expressions occasionally change to match Shouichi's.
- Happily Married: With Toru at the epilogue of her arc.
- Loser Protagonist: At the start of the series, he's the Butt-Monkey for Hikari and not allowed to forget by his classmates that he once held the worst scores out of anybody.
- Maybe Ever After: Hikari's arc ends this way, as following her date with Shouichi on the beach, they exchanged numbers, but never spoke to each other in five years, with Hikari leaving for Spain to study culinary arts after graduation. They happen to meet again by chance when Hikari returns to Japan and resumes working at the restaurant that formerly employed her, discovering that Shouichi is also now working there. Whether a relationship subsequently results between them or not is left ambiguous.
- Nice Guy: Friendly, polite and always willing to help anyone in trouble. It's easy to see why the girls fell in love with him.
- Otaku: He is a fan of anime, manga and video games, but it only gets major focus in Toru's arc.
- The Protagonist: The events of the series are all seen from his perspective.
- She Is Not My Girlfriend: In Episode 2, Shouichi has this reaction when he overhears Miu and Toka assume he is dating Hikari and gossiping about his relationship with her.
- Shrinking Violet: Shoichi is cripplingly meek and socially awkward to a fault, but he sneaks in some awesome zingers under his breath.
- Wholesome Crossdresser: Back when he was a kid, he cosplayed as a Magical Girl.
The heroine of the first story arc. Considered an idol by Shouichi's class, Hikari is a cheerful and friendly girl, with a mischievous streak. She has a part-time job working as a cook in a restaurant, something she tries to keep a secret.
- Book Dumb: At summer prep school, she is assigned to a class for poorly performing students.
- Character Focus: Even after her arc is over, she continues playing a role in the other girls' stories.
- Character Tics: Flailing her legs and wiggling her toes whenever she's in a state of relaxation or feeling lackadaisical.
- Does Not Like Shoes: Her case is a mild example, intermingled with kink. Since she wears Shouichi' pajama-like tracksuit, she tends to just pal around in slippers, even when outside. And when she's indoors, she is noticeably inclined to be barefoot, as she tends to fidget her toes quite a lot, and walked out into the common area hall casually barefooted (she had no bedroom slippers with her at the time) while carrying her outdoor shoes, in the second episode. In the third episode, Shouichi is actually distracted from his studies and even sexually aroused by the sight of her bare soles as she flops them back and forth.
- Enter Stage Window: Having been forced by her parents to attend summer prep school, Hikari attempts to escape, but finds herself being chased by deer back to the hotel she was staying at. To escape them, she climbs into the nearest open window, which just happened to lead into Shouichi's room (and as per Japanese courtesy, has her wedges off on entry). He's naturally freaked out, having been told earlier by Ikuo that the building is haunted by the ghost of a student who reportedly committed suicide by jumping out of a window, and mistaking Hikari for said ghost. Hikari objects by raising one of her bare feet up near his eyes and playfully wiggling her toes as proof that she's not see-through, although this isn't exactly a good way of proving her case and Shouichi struggles not to let her pretty soles arouse him.
- Erotic Eating: Gorging herself on Shouichi's own leftover soup, with a little dribble spilling out of the corner of her lips. Not only does Shouichi show astonishment at the fact she happily scarfed down something his own lips touched, his imagination runs wild at the prospect that this was basically a symbolic kiss.
- The Gadfly: She enjoys saying things to get a rise out of people. And pretending to act like a cat just so others will play along.
- Gamer Chick: She was one in middle school, when she used to hang out with Toru.
- Her Boyfriend's Jacket: Although they weren't dating at the time, Hikari wearing Shouichi's tracksuit throughout her time in summer prep school is clearly meant to evoke this trope, as it leads other students to mistakenly think they are dating.
- Limited Wardrobe: Deconstructed: Hikari spends a lot of her time in Shouichi's tracksuit (and a pair of slippers). He initially gave it to her because her clothes got wet due to falling into a pool and she had nothing to change into as she laundered them. Hikari continues using the tracksuit even when she has access to a broader selection of clothes just because she's grown fond of it, and to basically troll him and everybody around her.
- Maybe Ever After: With Shouchi at the end of her arc. She leaves for Spain to study culinary arts after graduation. They happen to meet again by chance when Hikari returns to Japan and resumes working at her old restaurant. Whether a relationship subsequently results between them or not is left ambiguous.
- Misplaced Retribution: Hikari's friends think she is turning her Gadfly tendencies towards Shouichi because she was upset at losing the previous year's Miss Santa competition to his older sister, Tomoe, despite Shouichi having nothing to do with it. Hikari herself denies this, however, stating that she was simply messing with him.
- Ms. Fanservice: She has a great body, and the show continues finding ways to put her in revealing outfits and suggestive poses, not to mention she likes teasing Shouchi over it.
- Paper-Thin Disguise: In Toru's arc, Hikari wears a pair of glasses at her workplace to avoid being recognized, as Kibitou's rules forbid its students from getting part-time jobs. Shouichi and Tomoe and the latter's friends recognize her anyway.
- Second Place Is for Losers: According to her friend, in her arc, Hikari was rather upset to have lost the previous year's Miss Santa competition to Tomoe.
- She's Got Legs: A large portion of her scenes are dedicated to showing off the fact she tends to have bare legs, judging by how many times she kicks them around.
- Silent Treatment: Because someone reported Hikari taking a part-time job whilst in high school to Kibitou's disciplinary committee, her parents barred her from going on the mixer trip she wanted to attend and forced her to go to summer prep school instead. In Episode 3, when Shouichi reveals that he knew Hikari was working that job, she suspects that he is the snitch, despite his assertions to the contrary. As Hikari starts giving him this treatment following that conversation, Shouichi believes that Hikari is still resentful of him. Fortunately, it's all cleared up.
- Supreme Chef: Everyone enjoys her cooking. At the end of her arc, she goes to Spain for a few years to study the culinary arts and reunites with Shouchi, who is working at the restaurant she used to work at.
The heroine of the second arc. Very good with her hands, she likes playing video games and crafting original things.
- The Ace: Toru is noted to be an honor student, a top athlete, a professional level gamer, and has a figure that leads to her friends asking her to model clothes for them.
- Babies Ever After: She has a daughter with Shoichi at the end of her arc.
- Big Brother Worship: Toru is implied to have this towards her older brother as a child, and it's suggested that this is the source of her gaming habit, as her brother used to be an avid gamer.
- Former Child Star: She won a TV contest when she was a kid.
- Gamer Chick: Her interest in games is what sparks her relationship with Shoichi.
- Happily Married: With Shoichi at the end of her arc.
- Ms. Fanservice: She has a very curvaceous figure, which gets emphasized in episode 8 when she cosplays as a video game character. The costume is surprisingly tight, so Shoichi has to help her reach the zipper to loosen it. Both look very embarrassed.
- One of the Boys: In her arc, as she strikes up a friendship with Shouichi, Ikuo, and Araki over video games. In Episode 7, it's revealed that she typically hung out with boys as a child since they shared her gaming interests, which alienated her from most girls.
- Sempai/Kōhai: Toru is a third-year student, while Shoichi is a second-year.
- Babies Ever After: She has a daughter with Shoichi at the end of her arc.
- Childhood Friends: With Shoichi. It eventually graduates into a Childhood Friend Romance in her arc.
- Housewife: She joins in the Home Ec club is to improve her homemaking skills.
- Otaku: A huge fan of Shojo manga.
- Ms. Fanservice: Gets dressed in a revealing Christmas dress in episode 10.