Fans of Gravity Falls, Star vs. the Forces of Evil, and DuckTales (2017) converged very well. It helps that, for the former, Alex Hirsch is voicing one of the characters and for the latter, that the magical world would fit right at home in that setting and for the latter, Dana Terrace had been a director in the first season prior to this series being greenlit. The fact that Dana Terrace is Alex Hirsch's girlfriend, and that the show deliberately employs many of the motifs employed by Gravity Falls, such as coded messages hidden in the art, also helps.
Amphibia fans also get along swimmingly with having plucky brown girls (Anne being Thai and Luz, Dominican) entering strange worlds and obtaining strange and unusual families. It helps that both showrunners worked on Gravity Falls and reference that show.
Interestingly, both shows also have multiple LGBT shippings and a growing LGBT Fanbase. Both protagonists are also commonly shipped with their female friends. The only difference is that while Luz is confirmed to be bisexual, with Amity being her canon love interest, Anne is only a headcanon and her bonds with Marcy and Sasha remains as platonic with a ton of subtext to boot.
This has grown after both shows ended with the finales of both shows featuring the female main protagonist sacrificing their life for others, meeting a deity-like entity, and coming back to life, and getting a Super Mode, becoming a Physical God in the process who battles their series respective Satanic Archetype alongside two of her closest allies and friends, though in differing orders of events, and ultimately end with the protagonist becoming a Messianic Archetype and with their own Distant Finale.
Given the similar premises, there's an overlap of fans from Little Witch Academia as well, with Amity noted to have similarities to Diana Cavendish, with her dynamic with Luz calling to mind Diana's with Akko. The main difference with Akko and Luz, however, is that Akko originally had magic before Shiny Chariot's magic spell sapped it away but Luz somehow has a huge potential of it despite being a human.
Also has this with She-Ra and the Princesses of Power, as Luz and Amity are noted to have similarities to Adora and Catra, with the latter having feelings of inadequacy, and having a prickly demeanor towards the protagonist, yet can’t bring herself to hate her. Plus, there’s some degree of Les Yay between them. As a bonus, She-Ra showrunner Nate Stevenson’s wife Molly Ostertag is a staff writer for the show. That being said, much of She-Ra's fanbase carried over to this show after the former ended its run. Even more amusing, both shows had the lead couple (Catra and Adora for She-Ra and Amity and Luz for The Owl House) dancing in prom with one of them wearing a tux and their dance together being the Signature Scene involving the Official Couple of the show! Interestingly, both Catra and Amity are cat persons (Catra being a literal Cat Girl and Amity having a cat palisman). After it's revealed that Lilith is the one who cursed Eda and she used Luz against her, many people have started comparing her to Shadow Weaver. And, the Big Bad of both shows happens to be an evil emperor who has no regard for any of his underlings.
Fans of Infinity Train also get along well since both shows have unique narratives of people Trapped in Another World. It also helps that parts 2 and 3 of Book 3 for Infinity Train is the same week as the season finale for The Owl House and both shows have the penultimate episode(s) of their seasons with a CliffhangerDowner Endinginvolving a character transforming into a creature. Moreover, the feelings the fans have for Lilith — for being the one to curse Eda — is the same as those for how Infinity Train feel for Simon after he murdered Tuba and they unleash a Kick the Dog moment upon the broken girl (Luz for the former and Hazel for the latter). However while Lilith redeemed herself, Simon ended up being killed.
There's also been friendly relations with the Mob Psycho 100 fandom. Fans of the two shows adore the concept of a con artist with a heart of gold (Eda and Reigen) who end up "adopting" the main protagonist who has powerful potential (Luz and Mob) alongside their school friends.
Likewise has one with fans of Welcome to Demon School! Iruma-kun due to similar premises (Human kid ends up in a monster world, taken in by a powerful figure (though adopted in Iruma's case), goes to a magic school and befriends a few of the residents).
There are also fans of Avatar: The Last Airbender, mostly because Amity is voiced by the same VA for Katara, Mae Whitman. Fans have even gone as far as comparing Hunter to Zuko as they are both misguided 16-year old boys with facial scars, trying to earn approval and affection from the Big Bad. The episode "Eclipse Lake" boosted those the parallels between the two shows, with Amity using Abomination magic in a similar form to waterbending, as well as Amity and Hunter fighting in a green cave, even after Amity tries to reason with him, similar to the season 2 finale of ATLA.
An intersection exists between Owl House and Helluva Boss fans, as both shows are Horror-Comedies with supernatural & fantastic elements, both contain LGBTQ representation, and both have involvement from Erica Lindbeck. They also have prominent owl characters.
To a lesser extent, there seems to be an intersection between Owl House and Helluva's sister show Hazbin Hotel; both feature a quirky bi girl as the protagonist whose love interest is a moody lesbian who would do anything for their partner, and who have a friendship with a tall, insanely powerful being with an affinity for the color red, a sentient staff/cane, a Nightmare Fuel inducing demon form, and a distinct Animal Motif. At least one DeviantArt artist even made a headcanon of Eda and Alastor secretly being siblings.
TOH fans are on good terms with fans of the manga Witch Hat Atelier. In fact, many WHA fans are also fans of The Owl House. This is largely due to the similar premise of a young girl discovering the world of magic, but also the darker aspects of magic society. This friendship was only further compounded when it was revealed that both the creators of The Owl House and Witch Hat Atelier are apparently big fans of each other's works.
Quite a few Tenchi Muyo! got into this show because of Eda being a borderline Expy of Ryoko.
With the Annie Award winning Netflix-animated series Hilda, with the premise of both shows about a protagonist dealing with the supernatural as well as lore for witches. In addition, many of the characters have many traits in common: Frida and Luz are witches-in-training, Luz and Hilda have a thing for befriending magical creatures and looking for adventure, as well as Eda and Johanna being motherly figures to the respective protagonists. There has also been crossover fanart of the main characters such as Amity and Kaisa relaxing or Hilda and Luz hanging out with elves.
With the upcoming animated series, Pibby. When the trailer dropped on YouTube with massive critical acclaim, fans created Pibby-themed edits of many characters such as Willow, Gus, King, and even Eda being consumed by the glitch, leaving Luz and Amity as the sole survivors, as one fanart by JMX641 on Twitter shows Luz and Amity helping Pibby escape and team up with her, Melira, and Alloy Boy to save the world. There's even a fan-animation on YouTube featuring Amity and Pibby interacting with each other.
Interestingly, with the Kamen Rider series, especially if Kamen Rider Saber or Kamen Rider Wizard are involved. This mostly stems from Reddit, with many a crossover posts between the two, so expect a few fans of the former franchise to have posts combining the two on both Reddit channels. Even moreso that there will be a few Owl House fans asking about the said franchise, and there are fans of both on The Owl House Reddit.
There's a little bit of friendliness with the 101 Dalmatian Street fandom, because both shows have a similar character: an antagonist who is a young abused blonde boy named Hunter who eventually performs a Heel–Face Turn.
Another with The Proud Family: Louder and Prouder due to both series having premiered in the early 2020s, featuring a POC protagonist (Luz is Afro-Latina while Penny is African-American) with a veterinarian mother. Both series are notable for having explicit LGBTQ+ representation, and both are the first shows to feature an onscreen kiss between gay couples within their respective Disney networks/platformsnote The kiss between Maya's dads Barry and Randall was the first in Disney Animation, but while streaming on Disney+, while that between Luz and Amity was the second, but the first on Disney Channel.
Fans of this show also turn to Mobile Suit Gundam: The Witch from Mercury in part due to the personalities and dynamics of the main characters Suletta and Miorine being very similar to Luz and Amity's, with some even calling them the "second coming of Lumity". As if by coincidence, Witch from Mercury's 2nd Season even started airing the day after Owl House's series finale.
There is also a decent level of overlap with the RWBY fandom, in part due to both shows being Feminist Fantasy series with substantial LGBTFanbases and Ship Tease between female protagonists featuring a Genki Girl protagonist whose experiences turn her into a Broken Bird. Luz and Ruby "dying" on the exact same day, April 8, is another case of this.
Many fans of this show are also fans of Arcane, likely due to the sapphic One True Pairing between main characters.
Even before it came out many Owl House fans were talking about My Adventures with Superman, mainly because of the shows iteration of Lois Lane looks and even acts like a grown up version of Luz.
There's overlap with the fandom for Wednesday. Both feature Latina teen girls attending a paranormal school with an emphasis on the macabre but also acceptance. There's also the fact that Joseph Crackstone is incredibly similar to Belos in motivation, evil, and sheer hypocrisy.
There's overlap with the fandom for Turning Red due to both works being Disney properties with a non-white teen girl protagonist, diverse casts, and characters who transform into large versions of normally small animals. The episode "Keeping Up A-fear-ances" in particular contains multiple parallels with a character having a rocky relationship with her mother, and the mother apologizing at the end.
