|This article is about a/an trope in the Tokusatsu Super Hero subgenre.|
An Area Fill 80%, as explained by Nobuo Akagi in episode 12 of Hikonin Sentai Akibaranger: Season Two, is a technique used in Japanese hero shows (mostly tokusatsu) to tease the coming of a new hero. An silhouette of the new hero is shown, almost completely blacked out but still giving an idea to their shape.
The concept of "Area Fill 80 percent" is explained by Nobuo Akagi (AkibaRed) in Hikonin Sentai Akibaranger: Season Two Ep. 12: Delusional Apostle, when the new hero, Prism Ace, appears and is previewed in a magazine as he takes the Sunday 7:30AM time slot from the Super Sentai Series.