BMO

Beemo (or BMO) is Finn and Jake's living video game system, portable electrical outlet, music player, roommate, camera, alarm clock, friend and even video player. It makes its appearance in the title scene of the Theme Song of every episode of Adventure Time, just before Finn and Jake pound their fists together. Beemo is the only one who can press the button under its D-pad to send a target to its main-brain-game-frame.

Development
When Patrick McHale was preparing a short animation for Cartoon Network, he had a robot character named Raye for that purpose, which Pendleton Ward and McHale loved. However, after Adventure Time got picked up, Raye was changed around and became Beemo.

Beemo's voice was originally going to be a computer voice, but after Ward's suggestion, Niki Yang's natural voice (also voiced Lady Rainicorn) with some adjustments became the voice of Beemo. As a result, Beemo speaks in East Asian accent, particularly Korean. Early voice actors included Dee Bradley Baker and Thurop Van Orman.

Gender
Beemo has been confirmed to be genderless. Beemo is referred to as "M'lady" by Finn in "Conquest of Cuteness", but Adam Muto has stated this doesn't mean anything. When being referred to by Finn, he will use masculine pronouns. When referred to by Princess Bubblegum, she will use feminine pronouns.

This is further evidenced in "Fionna and Cake" when Beemo is briefly seen in the tree house and has no noticeable differences in design, making it the only character not to have a swapped gender counterpart.

Appearance
Beemo looks like a half-Macintosh half-Game Boy Color with Atari 2600 controllers. It also shares some traits with a Vectrex.

Beemo is a medium-size green handheld gaming device, sometimes appearing with one or two controllers attached to it. When it's not being played it has an 8-bit face. The letters "BMO" are printed on its sides, indicating its name.

Beemo's default controller highly resemble the Atari 2600 game console controllers, as they both only have a joystick and one red button. Beemo's controller in "Too Young" slightly resembles a Sega Genesis controller for its button layout and handling design. An interesting note about this is that an Atari 2600 and Sega Genesis controller have the same controller input device in reality, meaning that both controllers can be hooked up to the same device without issue.

Beemo is sometimes seen with two slots to plug in controllers and sometimes with a compartment on that spot that opens up to where controllers can be plugged in.

Abilities
One of the many abilities Beemo has is a button (located under the D-pad) that sends the target into its main-brain-game-frame. Beemo possesses several attachments which can allow for other options aside from playing games, including a video camera that allows for the making of movies and a cord to allow for display of its screen to a wider audience. It also possesses editing software for the making of films, but has personal choice regarding the footage that is used for the films it can create. Beemo also contains keyboard like tools, which is used by Princess Bubblegum in "What was Missing". In "Conquest of Cuteness" Beemo reveals a built-in camera with the flash emerging from the top left of its head while its screen becomes the lens. As seen in "The Creeps," Beemo has a built in flash device that helps it take pictures. Beemo also has a built-in alarm clock, as seen in "Holly Jolly Secrets Part I." It is also seen in "Holly Jolly Secrets Part I" that Beemo can insert VHS tapes into the back of it, and display the video on its screen. In Incendium, Beemo uses its Beemo Cam, which is a live video feed.

Beemo is also capable of performing the devastating "Combo Move".

Episode appearances
Beemo made a cameo appearance in the episode "Evicted!", being played by Marceline while Finn and Jake are going house-hunting. It is also seen in "Business Time" when Finn and Jake are playing Adventure Masters on it. Also, in "Business Time", Finn and Jake are seen playing an Abraham Lincoln game (a reference to the Animated Short). It is later seen in the episode "My Two Favorite People". In "The Witches Garden," Finn was playing a game while discussing with Jake about how he got his magical powers. Beemo also is seen in "What is Life?" when Jake throws a garbage bag of butter on Finn, and in the episode "Donny" where one of the controls is smashed in half. Beemo claims to not have emotions, but Donny angers it by breaking a controller and throwing it at Beemo. In "Rainy Day Daydream", it shows a bored Finn and Jake a new game, "Conversation Parade".

Beemo appears again in "Slow Love" where it acts like a rebellious kid, refusing to turn down its music when Jake tells it. Beemo is then hit with a newspaper. Beemo was then pummeled and battered when Snorlock started dancing with lady snails while the tree house was on its back, but was apparently unharmed and returned to play music at the end of the episode when Snorlock was kissing his new girlfriend

In "Power Animal", Beemo unintentionally distracted Jake with songs. They were later eating lunch together and Jake told Beemo to hold his sandwich. It was later seen fixing the well overhang that lead to the gnome's underground hideout that Jake had demolished while entering.

In "Guardians of Sunshine", it is revealed Beemo has a button hidden under its control pad that allows people to be transported into one of his games. However, it does not allow Finn and Jake inside it, claiming it's too dangerous of an adventure. Despite it's warning, Finn and Jake trick Beemo by tickling it with a feather until it presses its button while it's sleeping. Beemo later appears when Finn and Jake exit the game. While trying to tear a bomba out of the game's interface, they make a hole in it. Beemo is then attacked by Sleepy Sam, Honey Bunny, and Bouncy Bee for imprisoning them in the game. After Finn performs a combo move and destroys the monsters, Beemo scolds them for going into the game and starts doing the combo move on them.

In "Video Makers", Beemo serves as Finn and Jake's cameraman, filming random pieces of footage around the Land of Ooo with a video camera attached to his head at Finn and Jake's request, before they decide to make a real movie, coming into argument about what kind of movie it will be. Beemo, as their cameraman, witnesses their arguments, and instead of using the footage they captured for the movie, it makes its own animation while singing a BFF Song about how Finn and Jake should forget their argument and make up. At the end of the episode, Beemo says Jake's favorite line throughout the episode, "Check, please!".

In the episode "Conquest of Cuteness" Finn and Jake call Beemo over to get a camera to take pictures of the Cuties but it turns out Beemo is a camera even though in the episode "Video Makers" Beemo has a video camera strapped to its head but it is possible bemo's built in camera only takes pictures.

In the episode "Too Young", Beemo asks about Finn's date with Princess Bubblegum and doesn't tell Jake where the key is to the Wizard Tower in his video game. When Jake is trying to cheer Finn up when PB jokingly "dumped" him, Jake puts both his feet on Beemo, using it as an ottoman, which annoys Beemo.

Beemo makes an appearance in "Adventure Time with Fionna & Cake". Its appearance remains the same; supporting that it has no gender.

In the episode "What Was Missing", Beemo has its controller stolen by Door Lord and serves as a musical instrument during I'm Just Your Problem. Marceline also used it to power a stove, showing that it is also a portable electrical outlet.

In the episode "The Creeps", it was in the mystery party when Finn and Jake came in the house. Its mystery name was Professor Pants. After the light went down and returned, Beemo and Jake went to the basement to get some candles, but Beemo was killed by the ghost. In the end of the episode, it was discovered by Finn in Lady Raincorn's body, being in the prank with Jake and the others. Beemo appears in Incendium watching over Finn while Jake was looking for another love interest for Finn.

Playable games

 * Adventure Masters (Business Time)
 * Racing game (My Two Favorite People)
 * Bug Battle (Donny)
 * "Galaga" or "Space Invaders" type game (What is Life?)
 * Conversation Parade (Rainy Day Daydream)
 * "Ghost game" (Slow Love)
 * Guardians of Sunshine (Guardians of Sunshine)
 * Blok Invasion (What is Life?)
 * Tower Climbing game (Too Young)
 * Excite bike (Incendium)

Quotes
See: Beemo/Quotes

Trivia

 * Adam Muto confirmed that Beemo's back story will be explored in a later episode.
 * In "Her Parents," Beemo appears to like scrambled eggs, even though it doesn't eat them.
 * In "Slow Love," Jake asks Beemo to lower the volume of the game, and it instead increases it, showing that Beemo likes to play jokes.
 * There is a Beemo tee-shirt in the FusionFall game.
 * Beemo can display emoticons on its screen, as seen in "What Was Missing."
 * In "The Creeps" Beemo said it likes taking nice pictures.
 * Beemo has a built in alarm clock, as seen in "Holly Jolly Secrets Part I."
 * When Beemo lowered its volume in "Holly Jolly Secrets Part I," it put itself on mute, but could still talk.
 * The correct way to spell its name is "Beemo," but on its sides the name is spelled "BMO" indicating its name. the character "JJ" has the two j's on its side meaning that a lot of robots in Ooo have their name written on them.
 * Beemo hosted the Adventure Time New Years Eve Marathon.
 * Beemo has a willingness to harm others; in the Season 3 episode, "Incendium," he says "If anybody hurts Finn, I'll kill them."
 * Played a Kancho prank on Finn in "Incendium."
 * As shown on the preview of "Five Short Graybles," Beemo does "weird junk" when nobody is around.