Least spoilery bits on top (that don't effect anything). In the game, the heroine is summoned to the world as a Saint to defeat the Demon King. So we don't see her until Charl goes to school at 15. Which takes a WHILE. The 12-year-old arc covers a lot of ground.
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BIG SPOILERS BELOW
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The heroine, Kanata, follows the cliché of having played the game before being summoned. She's a devout follower of Chris (the crown prince), and after being summoned plays the role of "Saintess" to the hilt...for all of two chapters. She mostly sees her coming in as the Saintess as an excellent way of committing "suicide by Charl," because the poor girl's suicidal.
Kanata is suicidal because the bomb(?) that killed Izumi/Charl was planted by Kanata's brother. Her family was hounded by reporters, her parents abandoned her, her relatives abused her, people at school bullied her...by the time she was summoned, she was skin and bones and covered in scars and bruises. More than half of her interaction with the capture targets was Chris trying to fatten Kanata up (and enlisting others to help), because Kanata basically became anorexic thanks to the bullying.
After finding out that Charl's a reincarnator, Kanata feels really guilty (especially after finding out she's Izumi). But once they get past that, it's fully a sister-like relationship.
Thank you so much! MC really here being everyone’s lil sister huh hahaha
Actually, Kanata and Charl are (physically) the same age, and the sister-vibe doesn't pick up until after Kanata finds out that Charl is Izumi. So in this case, Charl's the big sister.
Outside of her, I think that's the last of people trying to adopt Charl as their little sister. Mira is probably the only one who actively resents being family-zoned, though. He'd probably be 2ML if he had even slightly more screen time. So, uh. Don't mistake that. ╥﹏╥
What kind of person is the heroine?