The Wendigo

"'The Wendigo was gaunt to the point of emaciation, its desiccated skin pulled tautly over its bones. With its bones pushing out against its skin, its complexion the ash gray of death, and its eyes pushed back deep into their sockets, the Wendigo looked like a gaunt skeleton recently disinterred from the grave. What lips it had were tattered and bloody [....] Unclean and suffering from suppurations of the flesh, the Wendigo gave off a strange and eerie odor of decay and decomposition, of death and corruption.' ― Basil Johnston, an Ojibwe teacher and scholar"

The Wendigo is a monster, a hostile creature that exists in the Neutral Zone. This massive creature has been known to savagely attack (and usually kill) either loners or small groups/factions' scouting parties. Not much is known about this deadly creature, where it comes from, or why, other than its Wendigo physiology, it has come to be so horifically violent. It's said that it may end its killing rampage once it has defeated the love of its life's seven evil exes. Unfortunately, they were all killed by the virus, so the Wendigo will forever wander Supamerica looking for them.

Wendigo Physiology
Power to use the abilities of wendigo.

User with this ability either is or can transform into a Wendigo: a malevolent cannibalistic spirit strongly associated with the Winter, the North and coldness, as well as with famine and starvation.

Growth
The power to grow in size.

The user can increase the size of themselves or others to be a hulking giant, when the user grows their physical capabilities are also enhanced, allowing them to draw upon vast amounts of strength to superhuman levels.

Faction
Monster (not that it could understand what a faction is, anyway)