"Come what may, this beast must die today."
— Sgt. Thaddeus, Blood Ravens 7th Company, Dawn of War II
Jyabura: If you were still connected to that Shepherd and being protected, you would've been safe...but since a Lamb wandered around on his own, look...it'll be eaten by a fearsome Wolf...gyahahaha!
[is sent flying by a kick]
Jyabura: Who the hell are you...!!?
Sanji: The Hunter.
"I'm bored. Shooting pedophiles in the face will entertain me."
— Frank Castle, The Punisher
Security Command issued an all-points alert after the fall of Zebes. The alert concerns bioform Samus Aran, also known as the Hunter. Subject is a female hominid, and is heavily armed and extremely dangerous. (...) A considerable bounty will go to the unit who delivers Aran to Command. Dead or alive, it matters not.
— Space Pirate Data "The Hunter", Metroid Prime
Samus Aran, the accursed Hunter, has arrived. (...) Science Team suspects she requires [Phazon] to power her new armorsuit. Dark in color, it is equipped with strange new weapons. The troops now call her the "Dark Hunter." It is a fitting title.
— Space Pirate Log 06.362.2, Metroid Prime 2: Echoes
"Let us hunt those who have fallen to darkness."
—Shauna Vayne, League of Legends
Someone must stand against the night. Vampires, devil-lovers, slavering beasts and cannibal maniacs set forth each night in search of innocent blood and in the grip of twisted hungers. Terrible monsters plague the cities and stalk the wilderness. Only a coward could step aside to let them pass, and you are anything but a coward!
Naturally, you possess an edge that allows you to deal with the monsters on somewhat equal terms. You could be a scientist with deadly potions and devices; or an artillerist with an arsenal of potent weapons; or a priest or priestess whose faith cuts through the dark; or a sorcerer whose magicks make even the vampires tremble. Regardless of your methods, this is a holy calling. Your victims might dub you a heartless fanatic, but that isn't true at all. If not for compassion, you would not risk limb and soul to slay the dragons.
—Mage: The Sorcerer's Crusade - Companion
Imagine one day your home is suddenly attacked by monsters. They swagger into your village like it belongs to them. They kill your friends, they kill your family, they loot your home.
Imagine that they assault your sister. they torture her, they rape her, they kill her. They desecrate the bodies of your family, do whatever they want, cackling all the while. And you see it all from where you're hidden, trying not to breathe.
How could you ever let that go?
So you get a weapon, you train yourself, you learn, you grow. Everything you do is to help you take revenge. You search them out, hunt them down, you fight, you attack, and you kill them and kill them and kill them and kill them.
Sometimes things go well, and sometimes they don't. But each time you ask — how will I kill them next time? What's the best way to kill them? Day after day, month after month, that is all you think about.
When you get a chance, of course you test every idea you have. And when you've been doing all that long enough....