Resident Evil 4/Enemies

Los Ganados
Los Ganados (The Livestock in Spanish) are the primary enemies in the game, being a replacement for the Zombies in the previous games. They're inhabitants of a mountainous region who has been infested with mind controlling parasites called Las Plagas (the pests or plague in Spanish). Ganados look and can behave like other people, only distinguishable by their reddish eyes.

Ganados are much more dangerous than the Zombies of the previous games. Not only are the Ganados much smarter, faster and stronger, they are able to impersonate non-controlled humans (with no visible differences than their reddish eyes, which are only visible by night).

Colmillos
Colmillos (fangs in Spanish) are wolves that have been implanted with the Las Plagas parasite. They act similarly to guard dogs for the Ganados. Players will meet both regular Comillos, which act like an over aggressive wolf, and Comillos with more developed plagas as seen with gigantic flailing tentacles spurting from their backs. Colmillos generally appear to be more intelligent and aggresive in their attacks than Ganados because of their comparatively greater agility. They attack by either having their tentacles flail at victims or jumping onto victims and trying to rip out their throat. The Colmillos hunt in packs of two to four.

Novistador
The Novistador (which translates to unseen from Spanish) is a giant human-sized insect-like creature that was created by experiments with los Ganados. This creature has the ability to render itself invisible to the naked eye by changing the color of its exoskeleton. When invisible, Novistadors can be spotted by their glowing eyes, the ripples they emit while moving through water, their constant drooling, their breath (they often fight in cold areas) and their loud skittering noises. Novistadors often fight in packs of two to four and have wings upon their backs; often relying on them to move from wall to wall. They attack with their claws and spit acid at their enemies. Most commonly Novistadors employ sneak attacks where they spring upon victims who pass too close to their hiding spot.

Garrador
The Garradors (from the Spanish word garra, talon, it translates to "clawer") are warriors possesed by los plagas who wears equipment resembling those worn by gladiators. A garrador is equipped with large claws on each hand that can be extended and retracted at will. Garradors are very brutal creatures who will indicriminately attack, anyone and anything in it's path and are usually kept under strong restraint. Garradors are completely blind due to their suture eyes. Instead they rely on their sense of hearing to track down enemies and are easily distracted by loud noises, i.e. bells and gunshots. They have several attacks: one where the Garrador will swing its claws wildly at a supposed target, an attack in which the Garrador charges its target and impales it on its claws, and (when Leon is close to no health) where the Garrador swings and slices off its victim's head.

Armadura
Armadura (from Spanish, meaning armor) is a Plaga parasite that has taken possession of a suit of plate armor from Salazar's castle, which provides a sturdy defense. They attack with medieval weapons, such as broadswords and halberds. Their helmets are loosely attached, and once removed will expose a part of the inhabiting Plaga, which is extremely vulnerable to bright lights, e.g. from flash grenades. There are two varieties of the Armadura: one in a lighter-colored armor, which tends to contain a scythe-tentacle parasite, while the darker of the two will contain a centipede-type Plaga that is incredibly dangerous due to its instant-death headbite.

Additionally, some Armaduras may attempt to ambush their victims by staying still until their target approaches, at which point they attempt to hit the target with their axes, and will then invariably disintegrate from the stress of the blow, whether it be to the opponent or to the floor.

Strangely enough, Armaduras are the only plaga-infected enemy in the game which do not consist of a both living host and the invading parasite. This raises the question of how exactly the suits of armor are being controlled, (a Japanese walk-through book states that the Plaga inside has webbed it's tentacles in the shape of a human body inside of the armor) because in all other cases the plagas takes over the mind of its victim and manipulates it to control the body physically. To achieve this control a plagas must grow strong enough to overpower the victim; thus a person such as Ashley can be infected but still retain control and conciousness. No doubt though, there is no true explanation except for the fact that the designers desired a certain effect and atmosphere enhancer that could only come from a truly "empty" suit of armor, as opposed to one with a zealot inside (who in turn harbored a plagas within himself). The fact that living suits of armor were present in a beta version of the game seems to suggest this.

Del Lago
Del Lago (Of the Lake in Spanish) are giant monsters inhabiting bodies of water. Only one appears in Resident Evil 4.

El Gigante
El Gigante (the giant in Spanish), or more accurately Los Gigantes because there are more than one, are enormous human-like brutes who know nothing but destruction. Gigantes come from experiments with Los Ganados and Las Plagas, resulting in a large grotesque monster infested by plagas. They are often tied up (as seen in the village) or kept in enclosed places where they cannot wreak havoc. On the Island, Leon faces some that have been equipped with armor and chains. These are some of the most durable enemies Leon faces in the game, being maybe five times taller than himself and having an extreme amount of health (several rockets worth). They often attack simply by trying to squish their victims and in some cases throwing or swinging objects like boulders and trees. Three methods exist to kill a Gigante: 1) getting shot a ton, 2) slicing the plagas on its back, and 3) defeating it with environment objects like boulders or molten pits.

U3
The U3 was created by splicing genes from reptiles, insects and a human into one organism. It goes after it's prey with umatched agility. The U3 is fought in two stages. Intially it's a centaur creature with one tentacle arm a distende, bisected mandible and an enlarged tongue, Leon's weapons are only used to drive off the monster temporarily so as to freely move about in a maze of shipping containers in large suspended cages. Partway through this sequence, an enormous worm-like Plaga erupts from the creature's back and attacks with enlarged, scissor-like jaws. The erupted Plaga is the U3's weak point, as it is more vulnerable to damage than its host. Later on, on solid ground, Leon finally manages to kill the U3. There the U3 shows its ability to dive underground and burst out