Being the oldest in Maebara Keiichi’s class, Sonozaki Mion is the class president whom everyone looks up to as their leader. She highly respects Keiichi as her friend and rival, but it was revealed much later on that she actually has a crush on him. She acts like a tomboy and is often seen with a holstered airsoft gun, even though she is never seen using it.
I actually though she was Hatsune Miku at first, but it’s a good thing Ling emailed me the character information along with the photo! Could she be a cosplayer we know, I wonder?