One of the original five Justice League members, that spooky Martian guy. I'm glad he was featured prominently in the Justice League cartoon, because I think a lot of people don't know much about J'onn Jonzz, the manhunter form Mars. He has also more recently shown up in the Supergirl series and made an appearance in the Justice League Snyder cut. I think as a comic character, it took until recently in order for CGI tech to make him look... not silly.
Powers: All of them. Seriously, he's got a ridiculous power set. Super strength, super speed, invisibility, shape changing, intangibility, Martian vision (heat vision, but more Martian-like), telepathy... um... I'm sure I'm missing something. Any DC fans can fill in the blanks in the comments. In a JLA episode, Superman said of J'onn Jonzz, "There are only a handful of beings in the universe that I would be afraid to face in mortal combat and he is one of them." Or something to that effect.
Made in Clip Studio Paint Pro on a Surface Pro 4. Here is the timelapse video of my QuickPaint technique.
And here is the B&W line art version: