A nameless female mob unit in Blue Archive who serves as a part of Trinity General School's Justice Task Force. Despite her lack of distinctive characteristics she's managed to garner quite a following. For short she may be called 正実モブ (Seiji Mobu, "JTF Mob") or affectionately as モブちゃん (Mob-chan).
The named members of the Justice Task Force (with the exception of Koharu) all share certain character design elements in common with Mob-chan. Ichika is particularly close to them, both in terms of appearance and being most likely to interact directly with them. This has lead to a common joke that Mob-chan represents a "base form" that the other members have "evolved" from.