The protagonist... sort of. Thirteen-year-old Akari is just starting her first year of middle school, and she's excited to be reunited with her one-year-older friends Kyouko and Yui. She wastes no time joining her sempais in their "Amusement Club," and after that Hilarity Ensues — often at her expense.
Friend to All Living Things: Starts crying when she thinks she's trampled a snake, which was really only a toy that Kyouko had brought to the club to try and scare everyone, and asks Kyouko to deal with a cicada that flies into her room cause she herself doesn't want to hurt it. Safe to say she qualifies for this trope.
Nice Girl: When the other club members point out that she is fading into the background in the manga, this is the only characteristic any of them can think of.
Not a Morning Person: Starts the series oversleeping. In Season 1 Episode 12 (the last), she's the only one still in bed by the time everyone's brushing their teeth.
Oblivious to Love: Couldn't catch onto Chinatsu's feelings for Yui, to the point that she wonders whether it has become normal for girls to want to kiss each other.
Odango Hair: In one dream sequence she refers to it as her one and only distinguishing characteristic.
Ordinary Middle School Student/The Generic Girl: Even her best friends say that her most remarkable trait is being unremarkable! In S1E11, when Kyouko had a temporary personality change, Akari herself actually noticed her lack of presence is indeed her only special point.
Fourteen-year-old Kyouko is a blonde ditz with a crush on Chinatsu and is a constant annoyance to her best friend Yui. Despite her laziness, she proves to be a cram test top-scorer and is also a doujin artist.
Thirteen-year-old Chinatsu originally wanted to go to Tea Club, but ended up in the Amusement Club after the former was disbanded. To her chagrin, her uncanny resemblance to Mirakurun makes her a frequent target of Kyouko's cosplay pursuits.
Broken Pedestal: How she appears to some of the younger kids seeing her cosplay as Mirakurun. Or rather, when she breaks character while wearing it. A particularly tragic yet hilarious example occurs in episode 6 of season 2, when she screws up her line and pose. The shocked look on the young girl's face says it all. Later, Chinatsu starts scratching her back with the wand, and the little girl and her mother see it from a distance. Both have Dull Eyes of Unhappiness, and the little girl says "life is bitter". Her mom agrees.
This apparently applies to everything she makes - the muffler and chocolate she made for Yui in season 2 were so incredibly horryfing that they were censored. However, the chocolate she made for practice and, according to her, didn't put effort into, was completely normal.
Phrase Catcher: Her unenthusiastic Mirakurun cosplay will inevitably cause children to remark "Life is sour."
Fourteen-year-old Vice-President of the Student Council, master of place-name puns, and a tsundere par excellence regarding Kyouko, whom she resents for consistently topping her on tests even with several days' worth of study. Despite several side-by-side appearances with Yui to show their similarity, she is a perfect antitsukkomi when it comes to Kyouko.
A thirteen-year-old freshman and candidate for next year's Student Council Vice-Presidency, known for a rather shapely figure (not to mention well-stacked) for an early teen. She is generally a polite, sweet girl — except towards her rival, Sakurako.
Another thirteen-year-old candidate for the Student Council Vice-Presidency, naturally setting her up to a clash with Himawari (one that isn't helped by her complex about her flat chest), with whom she has ambiguously lesbian feelings. Really immature to contrast Himawari's dependability.
A-Cup Angst: Made worse by the fact that her chief rival for Student Council Vice-Presidency is rather well-stacked.
Green-Eyed Monster: Becomes the very definition of this when Himawari spends time after school teaching Chinatsu to knit a scarf for Valentine's day instead of tutoring her. She even throws a tantrum alone in her room and begins crying.
Schoolgirl Lesbian: As if stalking Akari wasn't enough, she has a relationship with Chinatsu's older sister Tomoko!
Stalker Shrine: Her whole room is one, devoted sister Akari (although she can hide all of her siscon stuff in a big wardrobe, if her sister from the future visits). She has even an an Akari dakimakura (hug pillow) — covered in lipstick kisses. Kyouko was massively creeped out by the room.
From the Mouths of Babes: In episode 5 of season 2, while waiting for Himawari, Sakurako makes another A-Cup Angst joke about her. Kaede arrives at the front door, and asks if she hates boobs. Sakurako says she doesn't, and then Kaede innocently says she'll share her boobs with Sakurako. Later, she brings some milk for her in an attempt to increase her bust size. Sakurako holds back hitting her since she doesn't know any better.
Bunny-Ears Lawyer: She is rather wacky and her inventions are prone to go kablooey, but sometimes, she does create amazing stuff, for example a flying clock (that will fly to anyone wanting to know, how late is is and tells them the time by voice) and a robot puppy with a clock instead of a head.