Thread:DemonicsFire/@comment-24442815-20191224020936/@comment-25501246-20191228001634

Eijiro and Mina going to the same school was known since the first databook, which was released in 2016, way before the Overhaul arc started. Information about the character's middle schools was included and listed the same school for them both.

It WAS trivia back then when it was just a note in supplementary material, but not anymore since the plot already showed it. Like you said, Trivia is for Easter Egg-like information. Eijiro and Mina going to the same school is a vital part of their backstories, not an Easter Egg.

Trivia is literally just for information that does not fit any other section. If it's already in Synopsis, Relationships, etc. then it's not trivia.

For example:

"Denki has a lightning-bolt shaped lock of hair" is not trivia, since it's mentioned in his Appearance section.

"Denki's lightning bolt lock of hair is natural" IS trivia, since it's information only present in the volume extras.