During the Marley arc, the soldier who lures Galliard and Pieck into a trapdoor has their face obscured by the camera angles, this made the readers to speculate that they were someone known, like a member of the Survey Corps in disguise, Pieck even mentions that their face is familiar.Turns out both of those roles were taken by the supposedly murdered redheaded conductor. In Baccano! (particularly in the light novel), a nameless woman in fatigues secretly making her way across the train is heavily implied to either be the Rail Tracer, expert assassin Claire Stanfield, or both.
She's innocent, and this piece of information is never brought up again. In the "Turnabout Showtime" case of the Ace Attorney manga, the defendant, Julie Henson, is suspected of killing her ex-boyfriend Flip Chambers because he left her for another girl.It turns out that Chiyu's Neurolinker was infected with a backdoor program, enabling the true culprit, her boyfriend Taku, to challenge Kuroyukihime remotely (even though he doesn't even go to her school). Haru refuses to believe it, since the Chiyu he knows is no good at video games or keeping secrets, and insists on convincing Kuroyukihime. Kuroyukihime initially assumes that it's Haru's Childhood Friend Chiyu, given the hostility between them in their first meeting (although Kuroyukihime intentionally eggs Chiyu on to gauge her reactions) and that Chiyu is one of a handful of possible Burst Linkers besides Kuroyukihime and Haru. In the first volume of Accel World, Kuroyukihime reveals that a Burst Linker known as Cyan Pile is trying to hunt her down to collect the point bounty on her, and she knows very little about the person controlling this duel avatar except for the fact that this person goes to her school (based on the fact that Cyan Pile can challenge her while she's logged into the school intranet).