A head-canon is defined as "Elements and interpretations of a fictional universe accepted by an individual fan, but not found within or supported by the official canon." More simply put, a different name for fan theories. But while fan theories can easily be backed up by hard evidence, head-canons tend to elaborate on what shows and books don't tell us. This includes everything from a character's reasoning for doing something to what animal a certain character would like the most. Tumblr is a hotbed for head-canons from every fandom you can think of, and some blogs are even dedicated to only head-canons. From former presidents, to classic Disney princesses, to cartoon characters, it’s hard to find a popular figure that Tumblr doesn’t have a head-canon for. Here are 15 of the best.

15 When Fandoms Collide

http://missa2016.tumblr.com/post/136753790582/if-hermione-granger-was-placed-in-the-star-wars

Harry Potter and Star Wars are by far two of the biggest series fandoms, so it's no surprise that there is a plethora of crossover head canons. This one toys with the thought of what Hermione Granger would do if she was dropped into the Star Wars universe, and if we're going off of Hermione's personality, it's not too much of a reach. Hermione Granger cares deeply about people and would do anything to protect her friends (like fight a troll), not to mention, she had her own organization that fought for house elf rights (SPEW anyone?), so it makes sense that she would fight for minorities in the Star Wars world. These minorities are Droids and Wookies, since they do not have a human voice that everyone can understand.

14 I Lava You

http://gameofdooweeoo.tumblr.com/post/157988623610/headcanon-the-two-volcanoes-that-fell-in-love-in

No franchise can escape from Tumblr head-canons, not even Disney. At the center of this one are two volcanoes from a Disney short titled "Lava" (shown before Inside Out in theatres), and the goddess, Te Fiti, from the now Oscar nominated animated movie, Moana. Though most likely just coincidental, this head-canon makes a lot of sense. At the end of "Lava", the two lovebird volcanoes merge together to form one island. Though Te Fiti is a goddess, when her heart was stolen she turned into a demon made of magma, which is commonly found in volcanoes. That means she had have to have been composed of Magma, which having volcano parents would pretty much guarantee.

13 Thank You

http://tinylilemrys.tumblr.com/post/95916770288/no-but-can-you-just-imagine-mrs-weasley-getting-to

The saddest head-canons to come out of Tumblr tend to be ones with a death heavy theme, which this one definitely is. There's no doubt that Lily Potter has a lot to thank Molly Weasly for. When her son, Ron, became best friends with Harry, she took him in like her own, into her own house providing a safe place for him to escape the awful people that were the Dudley's. This is a deed she goes largely under-credited for, even though Harry's life would be drastically different had she not stepped in as a mother figure for him. Though her death is heartbreaking to think about, the thought of her meeting Lily puts it back together.

12 Mac and Cheese

http://daily-hamilton-headcanons.tumblr.com/post/153167826129/lafayette-and-madison-often-have-dinner-together

Think America's founding fathers are exempt from Tumblr's head-canoning wrath? Well, think again. The popular hiphop musical about Alexander Hamilton exploded onto Tumblr, head canons based on both real history and events in the musical began popping up everywhere. This one stems from the history trivia that Thomas Jefferson loved Mac and Cheese–obsessively so. Jefferson discovered macaroni in Naples and Paris. He liked it so much that after writing a few letters about it and even sketching it, he brought it back to America. This pokes fun at the idea of his close advisor and friend James Madison, avoiding him just so he wouldn't have to eat it.

11 Bigger On The Inside

http://mugglebornheadcanon.tumblr.com/post/106833971436/1748-whovian-muggleborn-casting-spells-on-their

With another crossover head-canon, this Tumblr user runs a blog dedicated specifically to head-canons regarding muggleborn students at Hogwarts. Muggleborn witches and wizards are born to non-wizard parents, and it's speculated that that means they're more knowledgeable when it comes to pop culture than full blooded wizards. This makes thinking about the humorous ways in which they're set apart from their peers at Hogwarts both popular and fun. This head-canon brings the popular televison show, Doctor Who, into the mix, suggesting that muggleborn wizards that are 'Doctor Who' fans might be so inspired by the show that they try to make their wardrobes bigger on the inside.

10 Madame President

http://theresnobackstage.tumblr.com/post/112015168844/headcanon-leslie-is-president-by-the-time-of

Parks and Rec is one of the most popular sitcoms in modern times, and on Tumblr. The show has plenty of Tumblr fans who will head-canon the day away about even the smallest things, but Leslie's appearance at Jerry's funeral is a popular topic. Jerry's funeral takes place in a time jump in the final episode of the show, and is clearly much farther along in the future as Leslie and Ben are both shown with grey hair. But their hair isn't why their funeral appearance is so talked about, it's their company. The couple is accompanied by what seems to be Secret Service agents leaving audiences to wonder if Leslie, or Ben, became President. It's never explicitly stated, leaving Tumblr to their own devices.

9 A Special Helmet

http://imperfectlychaotic.tumblr.com/post/136178176042/please-take-a-moment-out-of-your-day-to-imagine

Rey *Last Name TBD* quickly became the precious cinnamon roll of the Star Wars fandom on Tumblr. As the only girl in the new main character trio, the fandom tends to be protective, but for good reason. Tumblr wants Rey to be happy and so do we, which is why this head-canon melts our heart. In the beginning of the The Force Awakens Rey is seen putting on a rebel pilot helmet as she sits in the sand, the simple scene setting up the dreamer side of her character. The thought of her getting to put on a rebel helmet that isn't all dusty, and putting it on to fly an X-Wing makes Star Wars fans just as happy as it would make Rey.

8 Retirement

http://notsureifyoureablogoragirl.tumblr.com/post/92855598022/nivalingreenhow-when-mcgonagall-finds-out-that

Professor McGonagall may have been a little hard on Harry and Ron at times, but she was a good teacher, and certainly not as relentless as Professor Snape. But as wonderful a woman she is, it's nearly undoubtable that having to teach a Weasley/Potter child would send her to an early grave. She doesn't have to worry until said child is 11, as that's the first year one can attend Hogwarts, but leave it to McGonagall to plan ahead. Though she doesn't have an iPhone, we're pretty sure that if she did she would download a countdown app as an additive to the calendar reminder.

7 The Power of Books

http://kissedbyatroll.tumblr.com/post/77732290903/headcanon-anna-has-read-most-of-the-books-in

Frozen became hugely popular in theaters, in homes with children–and on Tumblr. There are too many Frozen blogs to count, and countless head-canons ranging from small things to a whole head-canon universe where Elsa is dating Jack Frost. This cute Anna head-canon is simple, but still makes us smile. Anna had plenty of time to explore while Elsa isolated her, so it's highly likely that she read almost every single book in the library, and even read some of them multiple times. We know Anna is an avid daydreamer, so it's fair to say her favorite genre is romance. The thought of her trying to use pickup lines out of cheesy romance books is endearing, and a little embarrassing. At least she's trying!

6 A Tumblr Head-Canon About Tumblr?

http://mugglebornheadcanon.tumblr.com/post/106503646386/1713-muggleborns-introduced-tumblr-to

It's fair to say that muggleborn teenagers, like most teenagers today, would know what Tumblr is. Such a vast website is hardly a secret, but it most likely took the muggleborns introducing it to them for purebloods to hop on the bandwagon. And it definitely makes sense that the two groups would work together to make an easy magical fix to one of the most frustrating parts of Tumblr–customizing your theme. It can be easily done if you want a simple theme but a more complex customized theme involves the sometimes hard to understand language of coding. Oh how much easier life would be if everything could be done with a swish and a flick!

5 Cats, Dogs, or Droids?

http://star-wars-tfa-headcanons.tumblr.com/post/137601652615/sw-tfa-headcanons-on-cats-or-dogs

Head-canons can take many forms, from theory paragraphs to short categorizations, and this a good example of the latter. The poster's predictions don't seem to be too far off either. It makes sense that Kylo would be a cat person, since cats tend to have a sly untrustworthy nature, just like him! Hux and Phasma are probably more drawn to dogs because of their powerful leading nature, and the fact that they're descendants of wolves. Finn probably doesn't have enough domesticated animal experience to choose, and I can't blame Poe and Rey for choosing droids over dogs. After all, you don't need to house train droids! I personally would chose BB8 over a dog or cat any day.

4 Weighing The Pros and Cons

http://well-done-draco.tumblr.com/post/156749305209/pros-and-cons

Tumblr has a plethora of head-canons regarding Draco and Harry's relationship, some even centered around the speculation that they were lovers. The root of these head-canons seems to always be Draco's fixation on Harry, which is evident enough in the books to make the thought of Draco making a pros and cons list about Harry not too far out there. The Tumblr composed list offers a comical view at Draco's views on Harry, a big aspect of them denying that he's even fixated on him at all. Harry and Draco have a rocky relationship, which is to be expected when two people alternate between almost killing each other and saving each other.

3 Mama Hop

http://funniesandboxes.tumblr.com/post/145987182966/judy-sing-her-babies-adoptive-or-not-up-to-you

The popular animated movie Zootopia joins Moana and Frozen in the widely headcanon-ed about crew. A lot of these head-canons focus on Judy Hopps and Nick Wilde, sometimes even focusing on them as a couple. This endearing headcanon is centered around Judy and Nick's life as parents, and the dorky mom antics Judy would get up to. Judy is seen as a bit of a dork throughout the movie, but an ambitious one at that. Her personality is what draws Nick in, and even though he uses it to his own advantage at first, by the end of the film he genuinely likes her. Though their relationship was a pair is left on a pretty ambiguous note, Tumblr ran with the thought of them as a couple and produced head-canons a plenty.

2 Snow White On The Run

http://alantlm.tumblr.com/post/120176174284/alans-headcanon-snow-white-running-away-from

Even Disney classics like Snow White fall victim to Tumblr, though this head-canon answers a solid question. Why did Snow White run from the prince? On the surface the answer seems clear; she ran from him because most average girls would run from a stranger in the forest. But, how receptive Snow White is to the dwarves and the Evil Queen shows that she is naive, also showing that it would be out of character for her to run away in fear of someone. This Tumblr user brings up a good counter argument, saying that it is likely that Snow White ran because leaving the castle would land them both in grave danger, which is by all means a logical reason for her to have went the other direction.

1 A New Year's Resolution

http://jasontodd-is-alive.tumblr.com/post/155105212723/my-new-years-resolution-is-to-do-anything-batman

One of the more entertaining forms of head-canons are fake quotes where Tumblr users imagine what characters might say in certain situations. These are most commonly found in the comic books fandoms, where the entire fandom is more or less reliant on what characters say, since dialogue is how plots in books, especially those of the comic genre, are delivered. This quote fits Jason Todd to a T. Jason Todd is a fictional character in the DC comic, mostly seen alongside Batman. Though he idolizes Batman, he still has his gripes with him. Jason never understood the "never kill" rule, especially when it came to the Joker. Jason’s banter with Batman gives us a solid idea that this quote would be his MO, and murder is most likely on the list of "things to do that Batman wouldn't"