Throughout the House of the Dead series, numerous undead specimens have been created with the purpose of wreaking havoc in the area. Though most of these monstrosities have mostly been created by science and the mystery compound used by Dr. Roy Curien and many others, a handful of them were once living beings (such as the Rogan Commandos). Though the bestiary changes for the most part as the games go on..
A select few managed to make it through most (if not all) of the cast of monsters in each game; like the skeletal Kageo, the sludge-covered Ebitan, the worm-like murrers, bats, and (apparently a most recent favorite since the second game) the flannel-shirted axe-wielding Johnny. Otherwise, basic appearance and weaponry templates have been used throughout the series to make new creations, like the plain common zombies that like to bite, the crawling and jumping zombies that throw knives, and the infamous chainsaw zombies.
The House of the Dead
According to the Sega Saturn Manual in this game, Dr. Curien had a unique system of putting multiple breeds of undead in "Series", like the "Sam Series".
The Sam Series: This series is, according to Curien, how it all got started. Just as there are countless Sams infesting the mansion, there are multiple zombies in this Series including:
1. An almost-bald zombie that likes to bite.
2. A zombie in a black shirt and grey pants that likes to "karate-chop" his opponents.
3. A brown-shirted dual axe-wielding zombie.
Simon: A muscular zombie that throws barrels and people.
The Samson Series: A series of fat zombies that include:
1. A plain fat zombie that charges at you and throws barrels.
2. A fat zombie in overalls with a chainsaw.
Evitan: A paler version of the sludge-covered zombies infamous throughout the series. Curien claims he has no idea how this being was created while "puttering around the lab" one fine day. Little did he know that this revolting creation would continue to be a nuisance in the chaos to come under a slightly new name. In this game Evitan comes in three variants: a plain whole-bodied version that either jumps out of murky water or charges at you, another plain whole-bodied variant that is the same as the first except covered in blood, and half-bodied with two yellow jagged swords that pop up and fall upon you from the ceiling or openings almost everywhere.
Mummy: The equally infamous skeletal zombie (AKA: Kageo in future games) that prefers to wander mostly in the more "humid" areas to keep from drying out.
Rubin: The Rubin model is a zombie in a "skin-tight" business suit with a snapbrim hat and grinning leather masks. As Curien puts it, Rubin is a "vicious little monster" that likes to roll and crawl on the ground and go up walls, preferring to work in pairs. With Curien refering to Rubin as "being a prototype born during a creative phase", Rubin may have the the predecessor of all leaping breeds of zombies to come, like Randy. Rubin comes in two variants: in a black suit with claws and in a brown suit with two knives.
Monkeys: As the name implies are killer monkeys that like to jump around the place before attacking you and usually attack in pairs. Comes in colors white and black.
Maggots: Zombie worms with sharp teeth that like to lunge at your face and can be found squirming in groups or a fallen zombie corpse.
Randall: Somewhat similar to the Mummy, except in a green color with pants and a tendency to pop up at unexpected times.
Frogs: Giant frogs with big red jaws and sharp teeth that like to jump out of the water.
Winged-dogs: Demonic dog-like creatures with wings (which they don't use) that run at you and roar like a hyena when hit.
Bats: LIke to fly around in groups and fly at your face. Can also be found in a huge swarm when fighting the second boss "The Hangedman".
Green spider: Toxic-green spiders that scurry towards you for a bite.
Brown slugs: Brown fat slugs that appear very rarely and also like to bite like Murrers.
Lance: A light blue being that usually travels in pairs and likes to crawl and climb around while throwing blue energy knives at you.
Cyber zombies: Similar to the Monkeys and Lances except with armored bodies and a claw that can be shot at you repeatedly for a long range attack.
Curtis: A brawny zombie with a black mustache and beard who usually stands still while swinging a wrecking ball on a chain towards your direction.
Strongarm: A cyborg-like zombie with metallic parts (his left arm and the left side of his face) that are invulnerable to gunfire.
Mason: A muscular zombie who's taller than most of his brethren and carries a huge two-handed hammer.
Unger: A zombie with a bloody and skinless neck.
Burt: A fat zombie with a torch, which he wields like a chainsaw. Possibly a member of the Samson Series.
Commoner zombies: Lowly detailed zombies that are relatively weaker that like to either bite or strike. Possible members of the Sam Series.
The House of the Dead 2
[All names are canon, except those marked with an asterix.]
Ebitan: Ebitan is a revolting and perpetually rotting zombie. Accordingly, his resilience is lower than other monsters. Ebitan resides in the water, suddenly leaping from the murky depths to attack his prey. His main method of attack is to bite his prey. He comes in three variants in different colors: a green regular one, a black one with a better resilience, and a brown one that jumps at you out of the water without warning.
David: David is one big zombie. He is highly adaptable, thriving in all environments. His special attack is with his teeth. Beware of David's putrid breath!
Randy: Randy is a small, mask-wearing zombie. Don't be fooled by his lack of stature because Randy is a vicious little monster who can run along walls and ceilings as easily as on floors. Randy often roams with a friend. His preferred method of attack is a leaping death scratch.
Mickey: Mickey is a small zombie who wields knives in both hands. His method of attack is to leap down at his target from roof tops and other high places. Even if Mickey throws both knives at you, there's no time to relax. He can produce an unlimited supply of knives from his hips. Since Mickey has a tendency to move around a lot and can guard a bit with his knives, it's best if he's killed before he moves too far away from you, making him harder to hit while he can still hit you with ease.
Kageo: Kageo is a mummified zombie, who prowls the darkest, most dreadful areas. He may look weak, but watch out for his fierce punch.
Ken: Ken was modeled after Kageo. He wears an iron mask and is armed with vicious clawed gloves. His face is his most vulnerable part, but as it is covered, it makes Ken an extremely troublesome zombie to stop. Like Kageo, Ken also lurks in dark corners. Ken attacks with his lethal claws.
Bob: Despite being big and fat, Bob can move fast. Bob's principal form of attack is a drop kick. He also throws barrels and oil drums.
Max: You'll know Max when you see him. He's the zombie crazily swinging two chainsaws about. He's also the biggest of all zombies. He moves quite fast at times and may swing his chainsaws in front of his head, making a headshot more difficult.Johnny: Johnny is a tough zombie to deal with, as he loves to rush at his prey hiding his vulnerable face behind two axes. When he's not descending on you with terrifying speed, he will throw his axes with lethal accuracy from a safe distance. Be warned!
Gregory: Gregory is a bit of a show off and there is nothing he likes to do more before finishing off his victims than to flourish his giant sword. You will find it hard to aim your gun at Gregory, because he uses his sword to defend as skillfully as he does to maim.
Peter: Peter is infested with giant parasitic worms and is relatively weak. He puts his worms to horrifyingly effective use though, for when his chest is wounded, the parasites will leave Peter's ribcage and leap at his attacker. Peter can also pack a mean punch. To avoid having him sending a worm your way, avoid hitting his chest and aim for his head. If his chest is hit, he'll stop and waver around before the worm jumps out "chestbuster style", killing himself in the process.
Murrer: Murrer is a snake-like zombie, who often infests areas in hoards. Murrer attacks by flying at his victims and gouging at their faces with his myriad teeth.
Ricky*: A muscular zombie with exposed muscles and brain.
Shawn*: Another muscular zombie with an orange military beret.
Arjay*: A bandaged zombie in a brown-red vest who throws two golden shottel-like blades at once at you.
Franklin* : Present only in the final stage, these robotic zombies can appear out of nowhere and walk through walls to confront you with a punch. Like Lance and Dirk, his body parts cannot be blown off, meaning he'll be ready to strike no matter what.
Lance*: Present only in the fifth and final and similar to Mickey, Lance likes to crawl on walls and ceilings, throwing crescent energy blades at you. They have the ability to appear out of nowhere as well and teleport, making them difficult to hit.
Dirk*: Present only in the final stage, Dirk is armed with dual pulse sabers for hands to attack you with. Though he doesn't share any ghosting abilities like his robotic brethren, he can take a considerable amount of hits before going down.
The House of the Dead III
[All names are canon, except those marked with an asterix.]
Mark II: One of the variants of the Mark series, this extremely adaptable zombie was manufactured in great quantities. Mark II wanders about in groups searching for flesh, savagely attacking whatever he finds.
Frederic: Frederic is believed to have been created from a former researcher in the building. Moving with impressive speed and throwing swirling scalpels with deathly accuracy, his rapid attacks leave little time to react.
Charles: Charles is twice the size of a normal zombie. His thick layers of fat conceal his toughness. His strength puts him in a league of his own, and he'll keep coming at you even with holes blown through his stomach.
Azteca: Azteca drags along an enormous steel frame and has exceptional power. He wields a metal chain in one hand as though it were as light as straw. His weak point is his somewhat slow movement.
Kageo: A mummified zombie. Kageo is weak and slow, but in groups he is dangerous. His body is fragile. Of his appearance, only the shape of his upper body is known.
Rogan Commandos: The elite soldiers who stormed the building and tried to seize control. They remain trapped in a state between life and death, but they retain the superior fighting abilities they once honed through strict training. Though they have long used up all the ammunition from the shotguns they held when storming the building, they are still lethal with quick side-by-side movements and dual combat knives.
Raymond: Raymond uses his buzzsaw saws to cut through anything that stands in his way, whether it's a glass pane or a metal door. He grinds the blade against metal more for a flashy display than to keep the saw sharp, while covering his face right before he attacks.
Cain: Cain is the result of an experiment to create zombies fused with vegetable matter. He is as tough as an oak and his whip slices through the air with an audible crack to inflict more pain than poison ivy.
Julie: The remains of a former building employee. Julie will stubbornly pursue anything that comes her way and attack by flailing her numbed arms.
Morris: Carries a longhandled axe. Staggering under the weight of the axe, he may look like he can't handle such a weapon - but be careful: he puts his back into his fearsome attack.
Hugh: An agile midget with an impressive jumping ability that is usually holding something picked up from the trash as a weapon, like a fluorescent lamp and/or umbrella.
Mickey: Somewhat a reminiscent to the Mickey in the second game, this variant prefers to leap at his opponents and stab them with his dual knives rather than throw them.
Ebitan: A rotting zombie covered in green sludge as a result of being in immersed in water so long who prefers to bite his prey.
Koebitan: A slightly bigger Ebitan with more visible teeth.
Johnny: A prominent enemy from the second game, Johnny has returned with his dual hand-axes with a vengeance.
Victor*: A small agile zombie with a maniacal laugh, Victor enjoys jumping around the area with his electric blades before lunging at his opponents for an electrified attack.