- 10,000 Volt Ghost
- 1998 Curien Case
- 5.0.5
- 50-foot Woman
- A-Virus
- A Bao A Qu
- Aazelion
- Abada
- Abaddon
- Abalone
- Abel Cuvier
- Abholos
- Abhuman
- Abigail Prinn
- Aboleth
- Aboleth (Pathfinder)
- Abominable Snowman
- Abomination
- Abomination (Marvel)
- Abomination (Mass Effect)
- Abra
- Absimiliard
- Abstract Daddy
- Abyss (Dungeons & Dragons)
- Abzorbaloff
- Achaierai
- Acid Breath
- Acklay
- Acromantula
- Aculeozzo
- Adamantine Golem
- Adjule (Resident Evil)
- Adlet
- Advisor
- Adze
- Aegis VII
- Aeldari
- Aerico
- Aeroplane
- Aesir and Vanir
- Aether
- Afflicted
- Aganos
- Agares
- Agathion
- Agito Makishima
- Agropelter
- Agumon
- Agwel
- Ahool
- Ahri
- Ahuizotl
- Aigamuxa
- Aihai
- Ainz Ooal Gown
- Air Pirate
- Air Soldier
- Ak'chazar
- Akata
- Akhenaten
- Akkorokamui
- Akuma
- Alakazam
- Alala
- Alaskan Bull Worm
- Alastor (Hazbin Hotel)
- Albedo
- Albert Wesker
- Albert Wesker (RE films)
- Albinoid
- Alcina Dimitrescu
- Alduin
- Alex Wesker
- Alexander Isaacs
- Alexia Ashford
- Alexis Hall
- Alfur
- Algomon
- Alicorn
- Alien
- Alien (Dead Space)
- Alien (Fire in the Sky)
- Alien (Skyline)
- Alien Beast
- Alien Dimension (Apocalypse)
- Alien Necromorph
- Alien Ships (Apocalypse)
- Alien Squid (Watchmen)
- All for One
- Alpha Blogg
- Alpha Hopper
- Alpha Splinter
- AlterEgo
- Amalgam
- Amalgam Alpha
- Amanojaku
- Amarok
- Ambull
- Ame Onna
- Ammutseba
- Amon
- Amon-Gorloth
- Amon (Devilman)
- Ampulex Compressa Giganteus
- Amun
- Anabelle
- Anabelle the Doll
- Anakaris
- Anakim
- Anaxim
- AncientKazemon
- AncientMegatheriummon
- AncientMermaimon
- AncientSphinxmon
- AncientWisemon
- Ancient One (The Cabin in the Woods)
- Ancient Spirits of Evil
- Andre Delambre
- Andreenid
- Angel
- Angel (Dungeons & Dragons)
- Angel Star
- Angel of Death (A Quiet Place)
- Angelique
- Angelo
- Angels of Death
- Angry Bones
- Anguirus
- Anima
- Ankheg
- Annabelle the Doll
- Annastasjia
- Anole
- Anomura Fungus
- Ansem
- Antediluvian
- Anthony Fremont
- Anthropod
- Anthropophage
- Anthropophagist Monster
- Anti-Living
- AntiSora
- Antlion
- Antlion Grub
- Antlion Guard
- Antlion Guardian
- Antlion Soldier
- Antlion Worker
- Antlions (Terraria)
- Anubis
- Anubis (Resident Evil)
- Ao Andon
- Ao Bozu
- Ao Nyobo
- Ao Oni
- Aoyin
- Aperture
- Aphoom-Zhah
- Apocalypse
- Apollon
- Apotheosis
- Apsara
- Aptom
- Aqua Pirate
- Aqua Zebesian
- Aquatank
- Arachne
- Arachnid
- Arachnotron
- Arbok
- Arcadia
- Arcanine
- Arch-vile
- Archanfel
- Archie Benjamin
- Argus
- Argus Panoptes
- Arkadimon
- Armadillomon
- Armadura
- Armaggon
- Armoured Knight
- Armus
- Arrowtongue
- Art
- Art the Clown
- Artemis
- Arwassa
- Asad
- Asanbosam
- Ash Clam
- Ashberry
- Ashigaru
- Ashley Fallon
- Ashrah
- Ashwinder
- Ashwinder (Cinzal)
- Asphyxia
- Astagoth the Devourer
- Astaroth
- Asteria
- Astraeus
- Astral Dreadnought
- Astral Spirits (H.G. Wells)
- Astral Stalker
- Astro Zombie
- Asura
- Atlach-Nacha
- Atlas
- Atomic Flounder
- Atropal
- Atshen
- Audrey II
- Avatara
- Axe Man
- Axehandle Hound
- Ayi'ig
- Aylith
- Azalin Rex
- Azathoth
- Azazel
- Azhorra-Tha
- Azrael (Dogma)
- Azuki Arai
- Azuki Baba
- B'gnu-Thun
- B.O.W.
- BFG
- Baal
- Baba Yaga
- Baba Yaga (folklore)
- Babette
- Baboo
- Baby Dodongo
- Baby Kade
- Baby Kade (Malifaux)
- Babydmon
- Baccoo
- Bad Juju
- Bagan
- Bagul
- Bakekujira
- Baker Family
- Baker Ranch
- Bakumon
- Bakunawa
- Bakunawa:Sea Serpent
- Balloon Boo
- Balrog
- Bandersnatch (Resident Evil)
- Bandit
- Banshee
- Banshee (Mass Effect)
- Baobhan Sith
- Baoht Z'uqqa-Mogg
- Baphomet
- Baragon
- Baraka
- Barbara Streisand
- Barbara Streisand (South Park)
- Barbas
- Barbie
- Barnacle
- Baron Samedi
- Baron of Hell
- Barrel Spider
- Barroth
- Barrow-wight
- Bartleby
- Barugon
- Basatan
- Bashe
- Basilisk
- Basilisk (Dark Souls)
- Bast
- Bastiladon
- Bathsheba Sherman
- Battle Cat
- Battle of Armageddon
- Battle of Canary Wharf
- Battleship
- Battra
- Bauk
- Beast
- Beast (Marvel)
- Beast (Over the Garden Wall)
- Beast (SSSS)
- Beast Man
- Beast Walker
- Beast of Bodmin
- Beast of Bray Road
- Beast of Gévaudan
- Beast of the Land Between the Lakes
- Beastman (BNA)
- Bebop
- Beedrill
- Beelzebub
- Beetle (Dungeon Keeper)
- Beetlejuice
- Behemoth
- Behemoth (Kingdom Hearts)
- Beholder
- Bekataro
- Beldam
- Bell Gargoyle
- Bell Gargoyles
- Bell gargoyles
- Bellsprout
- Belly Button Eater
- Beloit Motto
- Ben Tennyson
- Bendy
- Benjamin Willis
- Beowulf the Lightbeast
- Berk
- Bermuda Triangle
- Berserker (Nightbreed)
- Berserker Knight
- Berserker Lord
- Berserkers (Nightbreed)
- Betamon
- Beyonder
- Beyonder (Pre-Retcon)
- Bhlemphroim
- Bi Beast
- Bi Fang
- Bido
- Bifrons
- Big Blue
- Big Boo
- Big Mother
- Bigfoot
- Bigger Boo
- Bile Demon
- Bilfinger
- Bili ape
- Bill Cipher
- Billbo-Negg
- Billdad
- Billy Bob Goblin
- Bindi Bergara
- Bio-Freezer
- Bioconstruct
- Biolizard
- Biomechanoid (Virus)
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