Kryb

Kryb is a monstrous alien supervillain from DC comics and a member of the Sinestro Corps, a society devoted to enforcing fear across the universe - as such she is an enemy of the Green Lantern, as well as the infinite other Green Lantern Corps members from across the universe.

Kryb is arguably one of the cruelest and most sadistic members of an already fearmongering Corps as she deliberately targets defenceless children, killing their parents and trapping the children in her alien physiology so as to feed on their fears.

History
A member of the Sinestro Corps, the alien hag Kryb has one of the most frightening methods of instilling fear. She targets members of the Green Lantern Corps who are married and have recently had children, murdering the parents and taking the children, keeping them in a sack like pouch on her back.

Powers / Abilities
Enhanced Abilities: Kryb has super human endurance.

Mind Control: Kryb is able to expel liquids which can take control of a person who comes in contact with them. The liquids then invade the target and bond to the hosts DNA, allowing Kryb to take control of their mind.

Qwardian Power Ring: Members of the Sinestro Corps use yellow power rings built on Qward and are fuelled by fear instead of willpower. The rings can create constructs based on the wielders own thoughts, produce energy blasts, generate force fields, instil fear, render the wearer invisible, allow them to phase, fly, absorb energy, translate languages, create spacial warps and even regenerate health in a limited way.

Trivia
Her trait of killing parents in front of their young and kidnapping said young is similar to Marvel's Orphan-Maker but she is arguably even worse than him as he is delusional and believes he is "saving" children while Kryb simply kills the parents and traps the children to feed on their fears.