For contributing a $100+ donation to the game's Kickstarter campaign, backers could choose to join a clan to appear under in the end 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 would be the most powerful weapon in the game (Clan Katana was the winner with the Grand Izayoi sword), while the remaining eighteen clans were Community or YouTube Partner Clans, who would each receive codes for specific items.

The Community Clans were represented by two Castlevania fan communities: the Dungeon clan (The Castlevania Dungeon forums), and the Operation Akumajo clan (a Facebook group spun off from these forums dedicated to promoting the series after its 25th anniversary in 2011). The participating YouTubers and companies were associated with Fangamer, a game merchandising company who managed the game's Kickstarter campaign. To unlock one of the Community/YouTube Partner Clan items, you must enter its respective code as the name for a save file, and as such only one clan item can be unlocked per 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 (referencing a quote by Albert Wesker from Resident Evil 5)
• chuggaaconroy: chuggaconroy - unlocks the Space Helmet (referencing 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 the Native American medicine man 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 from Mega64)
• Kinda Funny Games: TEAMFAT - unlocks A Kinda Funny Mask (the company's logo, the code being a reference to the in-joke #TeamFat)
• The Zaibatsu Clan (Super Best Friends Play): BULLFIGHTER - unlocks The-Baz Mask (a mask based on an original character they created who has made cameo appearances in various games)
• AlphaOmegaSin: ALPHAOMEGASIN - unlocks the Darkness Descends sword (referencing the 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 (referencing an in-joke regarding various novelty power strips)
• Vinesauce: SPONGYVINE - unlocks the Vine Sword (a sword themed around game glitch/corruption content with the green "Vineshroom" as the sword's helm, and the code's name being derived from the recurring in-joke character Sponge, the depressed third Mario brother)