The most horrific anime flashbacks were life-changing events the characters never forgot, shaping them into the heroes or villains they are today.

Flashbacks also manipulate time and space ... places the audience in a position where the viewer sees aspects of the narrative that other characters cannot see. This is used in murder mystery ...

There sure is. The Flashback series is built on a series of pictorial cards divided into narrative chapters. Each card represents the point of view of someone locked in a moment in time.