Though Shiro is able to censor himself, the only one who can actually make him swear is Matt. The guy is insufferable and can literally make the calmest person fly off the handle.
Hunk is the only one that knows that Lance is bi. Hunk watched him hit on a guy and get rejected and humiliated in middle school, and was sworn to secrecy once they entered the Garrison because Lance didn’t want anyone making fun of him.
Hunk is also the only one that knows that Lance has a bit of a crush on Keith. He figured it out on his own, because Lance still denies having feelings for him.
Lance knows that Keith is autistic, but doesn’t saying anything. Lance himself has ADHD and shares a few stims with Keith, like going on walks in the middle of the night. Sometimes they pass each other. Neither of them mention it.
Lance once asked what gender Pidge was attracted to, and she replied with the cryptic answer of “I don’t know, but definitely not lizards”. To this day, he still doesn’t know and Pidge won’t tell him.
When Keith revealed that he was part Galra, Allura was the most surprised, but Lance was the least. He had suspicions that Keith was hiding something, but he only put two and two together once Keith and Allura decided to run away because they thought Zarkon was after them - why else would Keith believe that the Galra had tabs on him?
Coran acts oblivious to the interactions the paladins have with one another, but he’s actually scarily good at reading and interpreting emotions.
Allura sees the paladins as a family unit, and her close relationship with the original paladins transferred to the newer ones. This is why she finds Lance’s flirting to be awkward - she sees the blue paladin figure as a caring brother.
Pidge has stated that her brother is incredibly smart, and Shiro can attest to that, but he sometimes does incredibly stupid things. The stupidest thing she can recall is that he once drank so much that she was able to convince him that he had six fingers on each hand.
Matt is actually very laid back, and is sometimes very manipulative. He used this skill to convince younger students at the Garrison to cough up their lunch money, and the older ones to do his homework for him - not that he couldn’t do his homework, just that he didn’t want to.
For fun, Matt would see how far he could push someone, often getting his peers to participate in stupid things, like hacking into the training simulator. This is how he met Shiro, who somehow fell for Matt’s ploy and ended up in detention with him the next day. Shiro was often his victim, but ended up becoming Matt’s impulse control.
Though Pidge seems relatively calm, she’s very stressed when at her computer. The only one who can tell is Shiro, who’s spent enough time with Matt to recognize it. He’s usually the one to deter Pidge from the screen when she’s had enough.
Matt and Pidge both have the habit of staying up late on their laptops, which is responsible for their poor eyesight, though Pidge’s is a combination of the laptop and becoming accustomed to wearing an extra pair of Matt’s glasses, her eyes adjusting to the prescription over time.
Shiro thought that Pidge was Matt upon initially seeing her after being rescued, but realized that it was Katie the moment she opened her mouth - Matt was loud and cocky, where she was quiet and insightful.
Both Shiro and Keith have a habit of stealing pens, but for completely different reasons. Shiro takes a pen, uses it, and then leaves it in the most random spot, whereas Keith puts them back where they were before, leaving Shiro to wonder where he left his pen.
Hunk is a complete neat freak and no one is allowed near the kitchen at all because once Coran put a knife in the wrong drawer and Hunk lost his mind trying to find it. He also tries to keep pens away from Keith and Shiro as much as possible.
Keith legit knows how to throw knives at people and once threw one Lance’s way to shut him up during training. It grazed his ear and Lance almost peed himself, and Keith had never felt more sorry in his life. Needless to say that everyone (even Keith) agreed that Keith is no longer allowed to use knives on the training deck when there’s someone else with him.
Allura is very good at keeping secrets. Unknown to the others, the mice tell her everything.
Everyone is waiting for Keith to wake up one day and be purple.
Pidge is the ultimate matchmaker without meaning to. Every pair that she glances at and thinks “are those two dating?” will end up together within a short while. This excludes Keith and Lance, who she predicted would be dating about a few weeks after she met Keith, and so far no such luck.
Keith made the bomb that he set off at the Garrison himself. He got the ingredients at a local store that sold construction materials. The owner gave him a few weird looks, but didn’t say anything.
Keith is actually really intelligent, but he lacks social skills. When Lance asked him to help out with the Voltron cheer, Keith knew that Lance wanted him to say “-tron” but couldn’t grasp why, so he just blurted out “Voltron” to try to give Lance the clue that he wasn’t making any sense, and that Lance should try to either explain or change what he was saying so that Keith could understand. It makes him angry that Lance couldn’t make out what he was trying to say, and blames this on a mix of him not being able to understand, as well as Lance being stubborn.
Lance had become Keith’s unofficial translator for social cues. The two have come to an understanding in which all Keith has to do is look at Lance a certain way and he will explain for him.
Having to be precise in engineering and technical work, both Pidge and Hunk are very artistic. Both of them have notebooks containing drawings of the planets they’ve visited, aliens they’ve met, and concept art of the other paladins. Most of these concepts stemmed from the idea of “what would Keith look like if he were fully Galra?”, or alternatively, “what would the others look like if they were aliens?”
Lance understands just as much as Pidge and Hunk when it comes to machinery, but he creates his own terms and concepts so that he can grasp it easier, which is why he can’t understand what they’re saying when they “techno-babble”. It took him a while to figure out that Keith is much like him in this way, but instead of techno-babble, Keith gets confused with what Lance would consider ordinary conversation.
Pidge swears a lot but Keith is the only one who’s witnessed it and no one believes him. On the other hand, Keith’s language is actually pretty tame.
Lance commonly uses innuendo and Keith understands them all and it makes him uncomfortable. What he doesn’t know is that it’s Lance’s way of flirting with him.
Pidge constantly messes with Lance by pulling the genius card and getting him to believe the stupidest things. Lance knows that none of the things Pidge tells him are true, but he likes seeing the others get a laugh out of it.
If anyone tried to hurt Pidge, they wouldn’t have any time to run because the other paladins would’ve killed them a good ten times over.
Hunk is pan, Pidge is ace, Lance is bi, Keith is gay, Allura and Coran are straight, and Shiro is…… *x-files theme plays*
The humans of the Castle of Lions all have inside jokes. Shiro is Space Dad, Galra Keith is funnier than normal Keith, Lance acts surprised whenever someone refers to the fact that Pidge is a girl, “we do not mention the knife incident”, Lance referring to them as the Power Rangers - stupid little things.
Hunk knows many languages and Lance knows Spanish. They both have conversations in Spanish when they want to talk in private, but also have a game where they switch to Spanish just as Keith walks in the room and have a normal conversation while glaring at him - “how was your day?” *glare* “fine, yours?” *angry grumbling* - and it confuses Keith.
The paladins got in the habit of throwing things at each other when asked to pass them. They’ve gotten so good at it that they barely need to look where they’re throwing.
Keith is hyper when he’s sleep deprived and it creeps the shit out of everyone mainly because he’s a lot nicer, especially to Lance.
Keith and Lance sometimes end up switching jackets. The first time they did it on a dare, but they got used to just picking up whoever’s jacket was closest to them at the time and returning it later. Hunk thinks it’s adorable.
When Keith and Lance start arguing, you can bet Pidge is in the background going “just kiss already.” Hunk busted a lung laughing when he heard, Shiro was confused, and Keith and Lance forgot about their argument to instead protest on why they definitely weren’t going to kiss (to both their dismay).
Keith honestly didn’t remember Lance from the Garrison, but developed a crush on him after becoming paladins. He couldn’t understand why Lance hated him so much. In reality, Lance had a crush on Keith since seeing him the first time at the Garrison, and chalked up his feelings to jealousy of Keith’s skill, which developed into their one-sided rivalry.
Blue is always talking to Lance about how he should really go talk to Keith, dropping hints that they should get together. Red is more subtle and prefers to pest Keith with comments like “just fuck already.”
Shiro rants in Japanese when he’s frustrated, usually putting his hands to his face and mumbling to himself until he either calms down or everyone else goes away. This rarely happened, but back at the Garrison, Matt used to put a hand on his shoulder or rub his back until he stopped.
Matt had special goggles made during his time with the rebels to replace his glasses.
Matt is openly gay and makes jokes and puns about it at every possible chance he gets.
Matt used to believe that Shiro died in the arena after stabbing him in the leg to take his place, but after hearing that the Champion became a pilot of Voltron, he sat down and laughed, crying tears of joy.
Other than Keith, only Matt knows that Shiro’s real name is actually Takashi, coining his nickname “Taka” back when they were in school.