A card named Vampire Hunter depicts a man wielding a whip. Since Yu-Gi-Oh! is also property of Konami, it is probable this character was designed with a generic design of a member of the Belmont clan. Furthermore, the original Japanese name of this card is Vanpaia Kirā (Vampire Killer).
The entire game is modeled after elements from classic Castlevania games such as Dracula's Curse and Rondo of Blood. These similarities include visual style, gameplay and much more.
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The fourth boss, Baron Vladmu, is a Dracula spoof that teleports in a similar manner and shoots fireballs from his crotch after opening his cape. In addition, the player can obtain weapons by breaking candles and a character called "Selena" throws scythes at the player just before they battle Vladmu, like Death guards Dracula.
As a reward for finishing a quest in the Castle of the Dead (which seems to be a reference in itself), the game rewards the player with a picture titled "Vampire Hunter", which seems to be a reference to Alucard or the Castlevania series in general.
During the battle against Psycho Mantis, he will display his mental powers by reading the system's memory card. If he finds a Symphony of the Night file data, he will say: "You like Castlevania, don't you?"
"Chapter 2: The Hospital" starts out with a short intro in which Dr. Fetus flies into the night with Bandage Girl outside the gates of the hospital, which resembles Dracula's Castle. Meat Boy looks upward while a theme very similar to Prologue plays. This is a reference to the intro from Castlevania for the NES.
The "Homunculus" enemy might be a reference to the Homunculus from Dawn of Sorrow. Other than sharing the same name, they both appear to be asleep until the player character is within range. Once spotted, they detach from the walls they are attached to and rush toward the player.
The Slipped Rib item might be a reference to Dracula's Rib as they both protect the playable character from projectiles.
In the Rosario + Vampire II manga series, the main character, Tsukune Aono, learns to control his vampire powers through the use of a magical whip that dispels demon power, called "Belmont". This is clearly a reference to the Vampire Killer whip and the Belmont Clan.
The manga series Zatch Bell!, called in Japan Golden Gash!! (金色のガッシュ!!,Konjiki no Gasshu!!?) featured a character named Sherry Belmont (シェリー・ベルモンド,Sherī Berumondo?). She assists her partner Brago (who has has a slight resemblance to a vampire), and her main-weapon is a flail.
Gaming music band, Starbomb, composed of American comedy duo Ninja Sex Party and Flash animator and internet personality Egoraptor, released their first and eponymous album in 2013, which included a song called "Crasher-Vania". The song was reminiscent of Bobby Pickett's 1962 novelty hit, Monster Mash, and talks about Simon Belmont crashing a party Dracula made for his friends. Not long after that, a video made by Flash animator Cas van de Pol, appeared on YouTube. It became very popular (with over 3,000,000 views since its initial release) and gave birth to the now iconic phrase: "Never fear, Simon Belmont is here!"
Simon Belmont appears as one of the title characters and a member of the N-Team in this American-Canadian animated series which ran from 1989 to 1991. Instead of the barbarian vampire hunter determined to stop Dracula at all costs, he is portrayed as an arrogant and vain individual who enjoys tending to his appearance more than fighting evil. Likewise, Dracula, known in the series as The Count, plays a major role as a recurrent villain and outright antagonist, commanding a roster of minions conformed primarily on enemies from Simon's Quest and Dracula's Curse.
One of the fictional languages created for the show by linguist David J. Peterson makes a reference to Castlevania, where the word for chain is "belmon"; "that's clearly a shout-out to Castlevania II: Simon's Quest.", he said.
The Hasbro cartoon series, My Little Pony: Friendship is Magic, pays homage to Castlevania by naming the third episode of the fourth season after it: Castle Mane-ia. This reference was confirmed by episode writer Josh Haber of Hasbro Studios via his Twitter account.
In episode 31, the vampire Camula (a homonym of "Dracula") summons a castle with a card named Infernalvania. While the name could just be a reference to Transylvania, Yu-Gi-Oh! is a Konami property and has referenced Castlevania in the past.