During the start of the first episode of Ren she dyes her hair black which lacks a ponytail and a hairclip along with wearing a much longerskirt in order to keep her identity a secret, but fails at the end of the first episode as she changes back into her old appearance, but during the finale she briefly wears her hair in twin braids, round glasses and white socks.
She's a Class Representative (and originally a cheerleader, but later joins the drama club as of Ren) from Togashi Yuuta's class who, like him, used to be diagnosed with a chuunibyou in which she labeled herself as "Mori Summer", but then moved to Icho Private Highschool in order to escape her horribly embarrassing past. She often tends to fight with Dekomori Sanae because of it in achieving the goal of erasing the traces of her own past as Mori Summer for good.
Shinka is generally described as a gorgeous and friendly girl in the anime, and is popular among her peers due to her good looks. However, she shows her blunt and edgy side when she's alone Rikka, Yuuta and others, particularly whenever it comes to dealing with Dekomori Sanae, who doesn't know is the real Mori Summer. She usually takes her frustration out on her whenever she says "fake Mori Summer" and feeding her milk, which Sanae deems poisonous, but it's later revealed that they actually care for each other and vice-versa.
Despite her flaws, she's a genuinely kindhearted girl who cares deeply about her friends/clubmates, and doesn't hesitate to help them whenever they need it. In Episode 7, it is revealed that she's enthusiastic when it comes to romance, but in Episode 9 Shinka makes it fairly clear that Rikka and Yuuta must be together, and often tends to help them on their relationship.
