Marvel Characters
Zarek is a member of the Kree race with no superhuman abilities or specialized weaponry, but as a blue Kree, he has enhanced strength, stamina and durability.
Zeus ruled a peaceful Olympus for centuries while he and his siblings populated the realm through interbreeding with humans, extradimensionals, Titans, and whatever else caught their fancy.
Twelve demons merged with Norman Harrison, who, soon after, adopted the guise of Zodiac and used his abilities to harness powers based on the astrological Zodiac.
War hero Simon Garth was turned into a zombie by his secretary, Layla, who was also a voodoo priestess, after being killed by his gardener, Gyps.
A chain reaction in an atomic reactor, a result of a terrorist attack, accidentally created a force that absorbed the electrolytes of the nearby humans' brains, granting the explosion of energy a rudimentary sentience.