Bill Finger
Milton "Bill" Finger (February 8, 1914–c. January 18, 1974) was an American comic book writer who was the co-creator (with Bob Kane) of the DC Comics character Batman. Despite making major (sometimes, signature) contributions as an innovative writer, visionary mythos/world builder, and illustration architect, Finger (like other creators of his era) was often relegated to ghostwriter status on many comics—including those featuring Batman and the original Green Lantern, Alan Scott.
While Kane privately admitted in a 1980s audio interview with his autobiographer that Finger was responsible for "50–75% of all the creativity in Batman," he publicly denied Finger had been anything more than a subcontractor executing Kane's ideas for decades. As a result, Finger died in obscurity and poverty while the Batman brand, and Kane, amassed international fame and wealth. In the 2000s, Finger biographer Marc Tyler Nobleman's research uncovered previously unknown heirs. At the urging of Nobleman, the online comics fan community, and others, Finger's granddaughter revived the fight to restore his lost legacy, which continued for years. In 2015, DC Comics's parent company conditionally agreed to recognise Finger's intellectual property claim as co-creator of the Batman characters and mythos, officially adding his name, going forward, to the "created by" credit line Kane had been contractually guaranteed in 1939.
Description above from the Wikipedia article Bill Finger, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Batman & Bill

Batman: The Long Halloween, Part One

The Lego Batman Movie

Batman: The Long Halloween, Part Two

Track of the Moon Beast

DC League of Super-Pets

Untitled The Batman Sequel

Batman and Harley Quinn

Joker: Folie à Deux

Batman and Superman: Battle of the Super Sons

Batman v Superman: Dawn of Justice

Legion of Super-Heroes

Batman vs Teenage Mutant Ninja Turtles
The Brave and the Bold

Alyas Batman at Robin

Justice League: Crisis on Infinite Earths Part One

Batman: The Killing Joke

Justice League

Justice League: Crisis on Infinite Earths Part Two

Batman vs. Two-Face

Snow Devils

Merry Little Batman

Justice League: Warworld

Scooby-Doo! & Batman: The Brave and the Bold

Batman Ninja vs. Yakuza League

Batman Ninja

Teen Titans Go! To the Movies

The Flash

The Death of Superman

Reign of the Supermen

Justice League: Crisis on Infinite Earths Part Three

Scooby-Doo! and Krypto, Too!

Teen Titans Go! vs. Teen Titans

Justice League Dark

The Batman

Batman: Death in the Family

Joker

Justice League Dark: Apokolips War

The Lego Movie 2: The Second Part

The Green Slime

LEGO DC Comics Super Heroes: Justice League - Cosmic Clash

Batman: Soul of the Dragon

Zack Snyder's Justice League

Dynamic Duo

Batman Dracula
Clayface

Justice League vs. the Fatal Five

Batman the Brave and the Bold: Showtime

Batman: The Dark Knight Returns

Pennyworth: The Origin of Batman's Butler

Batwoman
Lanterns

Titans

DC's Stargirl

Young Justice

The Penguin

Peacemaker

Gotham Knights

Superman & Lois

Batwheels
Bat-Fam

Batman

Teen Titans Go!

Superman: The Animated Series

Batman: Caped Crusader
