Resident Evil is rich with history and lore, which makes it attractable to both casual and hardcore fans alike, and perhaps its most interesting aspect is its diverse array of monstrosities in the game.
But also, the enemies that did not make the final cut in the Resident Evil games provide some interesting light on the Resident Evil universe and what elements could have been included in its lineup of monstrosities. Perhaps imaginative players can even envision, to a degree, that some of these enemies exist in the game's world but were cut from any encounters in the player's path.
Tyrant Inferior
The Tyrant Inferior was a scrapped enemy that was supposed to appear in one of the first Resident Evil titles but never made the cut. It is unclear if it would have been a boss or if there would have been multiple Tyrant Inferiors.
But given that Umbrella attempted to convert many human hosts to a full Tyrant, but had failed, it would not be surprising if there would have been multiple Tyrant Inferiors. They could have been experiments which failed to transition all the way into a Tyrant, since most hosts could not handle the process.
Wesker's Monster
Wesker's Monster was originally slated for Resident Evil 0 on the Nintendo 64. It can be seen in the Developer Diary video from 2015, showing the 2016 Resident Evil 0 Remaster. It was scrapped after it was determined that Albert Wesker would not be the main villain in Resident Evil 0, because the story writers had issues in the timeline in trying to link the game to Resident Evil 1. This would make sense, given that Albert Wesker was still undercover as a S.T.A.R.S. member at the start of Resident Evil 1.
Spider Man
Spider Man shows what looks like a giant tarantula taking over a human host, with its fangs possibly embedded in the back of its neck. It was also shown in the Developer Diary video in 2015 showcasing the re-release of Resident Evil 0 Remaster. Given that its legs and arms are embedded in the human host, it is possible that the spider could have been using the human body more like a physical puppet, rather than taking over its brain or nerves.
Zombie Ape
The Zombie Ape, slated for the original Resident Evil 2, was supposed to be unleashed by an Umbrella transport vehicle in the parking lot of the Raccoon City Police Department during the outbreak. It is unclear if these were Bio-Weapons which Umbrella was trying to transport out of the city for safe keeping, or whether Umbrella transported them into the city to unleash them as part of their sick experiment.
Licker Zombie (and MORE)
The Licker Zombie, along with the Wheelchair Zombie and Condemned, are shown in Concept Art that can be unlocked in Resident Evil 2 Remake, and these enemies were originally slated to be in the game.
The Licker Zombie appears to be zombie with a Licker's head, suggesting that it may be a Licker that has not fully transformed. Another theory is that it could have been a new type of Licker as a result of infecting a zombie host, rather than an actual human host.
Wheelchair Zombie
The Wheelchair Zombie, still wearing a lab coat, visually appears as if it could be an Umbrella laboratory scientist possibly in the early stages of a G virus transformation, or one who has not completely or successfully transformed. Given that he is still using the controls on his wheel chair and has some level of his previous intelligence, it is unlikely that he has the standard T-Virus infection.
Condemned
The Condemned appears to show a skinny child in some sort of neck brace. It was originally scheduled to show up in the Orphanage section of Resident Evil 2 Remake. Given that Umbrella did experiments on the children at this Orphanage, this may explain his transformation.
Secondly, if one reads the details of all the lore, there was a child named Oliver in the Orphanage who had undergone some very cruel experiments by Umbrella. There is room for theorizing that this enemy could have been Oliver. This creature was originally scheduled to be an enemy that would be talk Dr. William Birkin's daughter, Sherry Birkin.
Wildcat
The Wildcat was originally scheduled to appear in Resident Evil 3: Nemesis in Raccoon Park, but the Hunter Y replaced it. Presumably, it came from the Raccoon Zoo nearby and became infected unintentionally by the T-Virus.
Black Fog
Black Fog was originally slated for Resident Evil 4, and was supposed to be a new virus created by infamous villain Albert Wesker to infect Leon Kennedy. Hideki Kamiya decided it needed to be dropped because the GameCube's technology at the time did not have the graphical power to make an animation that would look visually realistic.
Armored Ganado
Among the many rejected Ganado designs for Resident Evil 4, perhaps the most interesting one is the Armored Ganado, which looks to be wearing medieval armor. Given that the Los Iluminados cult existed way back during the Spanish Inquisition, and they beefed themselves up with Las Plagas parasites back then too, some fans of Resident Evil lore may find it enjoyable to play with the strong possibility that these could be armor sets from the original cult, given that the first design bears their symbol on the breastplate.
There, too, is the possibility they may have even been original cult members that were trapped in the caves below the castle; however, it is unclear if the overall life-span is increased significantly by those infected with the parasite, as they would have had to survive hundreds of years. Many other Ganado enemies were dropped as well, including the Arcanist, Assassin Bear Claw Man, Bound Slave, and more.
Hook Man
The Hook Man became semi-famous among Resident Evil enthusiasts during the E3 2003 live demo of Resident Evil 4 and other advertising segments. While infected with the a virus, Leon Kennedy was to encounter many hallucinations, including the Hook Man, who would burst out of a painting. Hook Man had teleportation powers and was a relatively quick enemy, that could be weakened by light.
It is unclear if he was merely a hallucination of Leon's, or an actual foe that appeared differently due to Leon's hallucinations. Either way, it is an interesting take on an enemy design which would have given Resident Evil a dash of psychological-horror, though not quite supernatural horror.
Ultimately, the design was scrapped and simply existed to demonstrate the special effects of Resident Evil 4's engine. Yosuhisa Kawamura stated that the enemy was inspired by the American horror movie, Lost Souls, and specifically the seen in which Maya Larkin hallucinates while inside an old building with a killer stalking her
U-9
The U-9 was originally an 80 foot tall behemoth that would have been the result of the Urboros virus in Resident Evil 5. Its worm-like visual elements give it striking resemblence to other Uroboros-infected enemies that were included in Resident Evil 5.
Some players theorize that doing battle with this huge monstrosity would have required mounted artillery, or the Satellite Laser Device that was used against the Uroboros Aheri boss in the final build of Resident Evil 5.Had this creature been included in the final cut, it would have been potentially the tallest enemy ever in all the Resident Evil games.
Other Baker Family Members
The Baker family was iconic to Resident Evil 7, and the franchise as a whole, perhaps comprising the creepiest aspect of the 7th main game in the franchise. These characters clearly got under the skin of many players, resonating vibes similar to villains in a Texas Chainsaw Massacre flick. It is interesting to note that there were other members of the Baker Family planned as well, including a pet Dog, a Servant, and the Creepy Twins.
Koshi Nakanishi stated that the dog's name was going to be "Diane," and would have made its first appearance during the dinner scene of the game. Nothing is really known about the Baker Family's servant or the Creepy Twins.
Other Creatures
Among plenty of other canned enemies, there includes Sea Snakes, the reptilian looking D.A.L.I., the Man Spider (not to be confused with Spider Man), the giant Golgotha, a hideous Transforming Creature with giant teeth-laden mouths for its pinching hands, and a mutated Parasite Woman in Resident Evil 4. Resident Evil 6 was also slated to have some hideous tick-creatures that would infect their hosts, along with gigantic flying mosquitoes.
Resident Evil 7Â was also supposed to include a zombie that would reside in the Baker house, requiring the player to hold their breath when it was nearby, but it was canned because it was believed it would make the gameplay too tiresome.
There are many other enemies in the Resident Evil franchise that did not make the final cut of its many games, which are not included here. But these appear to be the one's that are either the most interesting in concept, or have the most information available for them to give them some level of context.For those who are eager to know more among the franchise's bestiary, there is a near endless supply of Resident Evil lore and history available on the web.