Up now at my website The Comicologist is an article that I wrote on Thanos for the magazine ACE back in 2015.
Panels from The Infinity Gauntlet #1 © 1991 Marvel Comics. Pencils: George Pérez.
Inks: Josef Rubinstein & Tom Christopher. Colors: Christie Scheele & Ian Laughlin
I’ve posted a version with images and one without, since the former is rather heavy on the graphics. That’s due in part to the article’s length, which in turn is a consequence of the breadth of the character’s publication history — or vice versa. You might want to wait to read it until after you see Avengers: Endgame if you’re not already familiar with the comics, although my guess is that any spoilers pertain more to last year’s Infinity War.