What Are Man-Thing's Powers In Werewolf By Night?
In the comics — and, judging by his first name, in the MCU as well – Man-Thing's human identity is Dr. Theodore Sallis, a scientist who messed around with a super-soldier serum that's decidedly not the one Steve Rogers (Chris Evans) received. A combination of this serum and extremely powerful magic turns Ted into the swampy, red-eyed creature we see in "Werewolf by Night" — but its plot barely begins to claw at his full scale of abilities.
In the comics, Man-Thing's touch can burn people just like in "Werewolf by Night," but there's a twist. Instead of being a sentient and somewhat whimsical figure his MCU version seems to be, the comic book Man-Thing is both more and less than a human. Along with his various magical properties, he's essentially a physical manifestation of nature, and the swamp terrain in particular. As such, he's an utterly inhuman, instinctive figure, who however seems to take offense against all things evil. His burning, corrosive touch is also fatal to those who feel fear.
Apart from his lethal touch, Man-Thing possesses various superhuman physical attributes, including super-strength and the capacity to heal from virtually any damage by "rebuilding" himself from vegetable matter. This ability has also sometimes enabled him to alter his size, and control plant life in the surrounding area. Oh, and because of his mystical nature, he also has a number of magical abilities.
It's clear that the MCU version of the character is at least somewhat different from his comics counterpart, as showcased by his obvious sentience, a notable preference for his human name, and ability to form friendships, and even his apparent affinity for sushi. However, should the movies and Disney+ shows wish to explore the character further, they certainly have a treasure trove of powers to draw inspiration from. For now, however, his full MCU power set remains among the untold truths of "Werewolf by Night."