More than any writer to have ever existed, Stan Lee loves to insert himself into his work. While most fans have become familiar with his cameos in every Marvel movie between X-Men (2000) and Avengers: Endgame, he, frequently alongside former colleagues Jack Kirby and Steve Ditko, appears in multiple series across Marvel Comics. From quiet cameos to full-blown self-inserts, Stan Lee was a character both on the page and off.