As a reward for contributing a $100+ donation to the game's Kickstarter campaign, backers could choose to join a clan of their choice to appear under in the game's credits. Six "Sword or Whip" Clans (connected to a vote on if Miriam's personal weapon should be a sword or a whip) were dedicated to voting on which Sword or Whip weapon would become the most powerful weapon in the game (the winner being Clan Katana with the Grand Izayoi sword), while the remaining eighteen clans were Community or YouTube Partner Clans, who would receive a code for a clan-specific item.

The Community Clans were represented by two Castlevania fan communities: the Dungeon clan (The Castlevania Dungeon forums), and the Operation Akumajo clan (a Castlevania Facebook group spun off from The Castlevania Dungeon dedicated to promoting the series following its 25th anniversary in 2011). The YouTubers and other companies who participated in the last clan group were associated with Fangamer, a video game merchandising company who managed the Kickstarter campaign for Bloodstained: Ritual of the Night. To unlock one of the Community/YouTube Partner Clan items, you must enter its respective code as the name for your save file, and as such only one clan item can be unlocked per save file. The participating clans and their codes include:

Community Clans:
•The Castlevania Dungeon: DUNGEONITE - unlocks the Dungeonite sword
•Operation Akumajo: Akuma - unlocks the Dominus sword

YouTube Partner Clans:
•ProtonJon: EGGFARM - unlocks the Guardian Egg Helm (a reference to a line spoken by Albert Wesker in Resident Evil 5)
•chuggaaconroy: chuggaconroy - unlocks the Space Helmet (a reference to the helmet worn by Olimar from the Pikmin series)
•NintendoCapriSun: INTHEBATHROOM - unlocks the Dumping Helmet (a bathroom-themed in-joke from his content)
•JoshJepson: JEPSON - unlocks the Clockwork Blade (origin unknown)
•StephenPlays: STEPHENPLAYS - unlocks the Sicilian Slicer (a pizza-themed sword, Pizza both being the name of his dog and a recurring subject of vlogs)
•SwimmingBird941: swimmingbird - unlocks the Plague Doctor Face (possibly a reference to the anime "Cowboy Bebop", as series protagonist Spike Spiegel is referred to as "Swimming Bird" by a Native American medicine man named Laughing Bull)
•Far From Subtle: AWESOMEVIDEOGAMES - unlocks the Big Mustache (an in-joke from their series VideoGames AWESOME!)
•The Speed Gamers: TheSpeedGamers - unlocks the Final Hour sword (a speedrunning-themed sword)
•Egoraptor: Egoraptor - unlocks Hey I'm Grump (a helmet of Arin Hanson's stylized head from Game Grumps' intro)
•Game Grumps: Grumps - unlocks I'm Not So Grump (a helmet of Dan Avidan's stylized head from Game Grumps' intro)
•Mega64: Jarvis Meower - unlocks the Mega64 Helmet (a collage of various recurring in-jokes throughout Mega64's run)
•Kinda Funny Games: TEAMFAT - unlocks A Kinda Funny Mask (the company's logo, the code being a reference to the #TeamFat in-joke from one of their series)
•The Zaibatsu Clan (Super Best Friends Play): BULLFIGHTER - unlocks The-Baz Mask (a mask based on an original character created by Super Best Friends Play who has made cameo appearances in various indie games)
•AlphaOmegaSin: ALPHAOMEGASIN - unlocks the Darkness Descends sword (possibly a reference to the studio album of the same name by American thrash metal band Dark Angel, which AlphaOmegaSin has described as "one of my go-to albums")
•Game Sack: 8MEGAPOWER - unlocks the Game Sack Strip sword (a reference to an in-joke regarding various novelty power strips)
•Vinesauce: SPONGYVINE - unlocks the Vine Sword (a sword themed around Vinesauce game glitch/corruption content with a green mushroom [Vinesauce's logo, the "Vineshroom"] as the sword's helm). The name of the code is derived from Sponge, a recurring in-joke character from their streams who is depicted as the depressed third Mario brother.