Legion of Superheroes Election
In the constitution of the 31st century team known as the Legion of Superheroes is a section mandating a cyclical election to vote in a new team leader. Several notable elected team leaders have been Dream Girl, Element Lad, Saturn Girl, Wildfire, Mon-El, and Sensor Girl.
Letter Columns
Until the Silver Age of comics (and even beyond in certain cases) it was common to have a section of a comic dedicated to answering reader's letters. These columns often took on the names in reference somehow to the title's name. They are alternately known as comic book letter columns, lettercols, letter pages, or letters to the editor. Numerous famous comic creators have famously submitted letters to columns before starting their careers.
Mad Scientist
The mad scientist is a stock character of a scientist who is perceived as "mad, bad and dangerous to know" or "insane" owing to a combination of unusual or unsettling personality traits and the unabashedly ambitious, taboo or hubristic nature of their experiments. Popular in literature, movies, TV shows, and of course comic books.
Marvel -1 Flashback Month
In July 1997, Marvel Comics released #-1 issues of most of its comic volumes in an event dubbed Flashback Month. These issues were meant to showcase untold tales from their characters origins. Titles involved in the "Heroes Reborn" event did not participate in the Flashback Month.