Bumblebee (Karen Beecher) is the former leader of Titans East and a superheroine in Teen Titans Go!. She made her first debut and cameo in "Starliar". She temporarily becomes the 6th and newest member of the Teen Titans in the Sixth Titan arc, from "Forest Pirates" up until "The Viewers Decide" when she leaves both Titan teams to work as a solo hero with the alias "Bat Bee."
Bumblebee appeared with her teammates at the annual Titans East party in "Starliar." She was disappointed with the Teen Titans' behavior, and did not want them to join next year's party.
In "Two Bumble Bees and a Wasp," at the hospital, there was a balloon next to Beast Boy that reads, "You'll bee OK," with a picture of her face on it.
She also makes a cameo appearance in "Yearbook Madness." Her head is seen in a photo along with Starfire, Raven and Jinx. She is later seen dining at the Yum Yum Kitty Diner with her fellow teammates. Robin forces her team to sign his yearbook.
She is seen fighting Mother Mae-Eye over a television set in "Black Friday". In "Garage Sale," the balloon with her face on it appears again in the attic.
In "Costume Contest", she was dressed as a Grim Reaper, scaring Más and Menos and taking their candy.
As shown in "Flashback", Bumblebee was invited to a Teen Titans tryout by Robin. During the tryouts, she experience Robin's temper torwards the other superheroes that would later become his teammates. Because of this, Kid Flash suggests that they kick Robin out and that he should be the leader instead, to which Bumblebee, Speedy and Aqualad agree to. They take the Titans Tower from Robin and form their team.
Later on, Bumblebee and the others are challenged by Robin's team to a competition to take back the Tower and to reclaim Robin's status as leader. Eventually, the Titans overthrow Kid Flash, breaking his leg and throwing him out of the Tower. She sees Kid Flash hobbling away, telling them they should form the Titans East on the East Coast.
After staying with the Titans for a few months, she grows tired of her life hanging around with a group of degenerates and ultimately defects herself from Titans West in "The Viewers Decide" by becoming Bat Bee.
Personality
Bumblebee is positive, enthusiastic and peppy, since she enjoys seeing the optimistic perspective, like Starfire. She is always hyped to join the rest of the Titans, but on the other hand, she also seems to be the only member to voice out her own opinions, such as stating her disagreement on Robin's claim of holding a hilarious campfire will attract wolves in "Campfire!".
Bumblebee also seems to have a fervent interest on romantic subjects, namely camp romance as shown in "The Bergerac" when she gets pumped up over Robin's budding romance with Wonder Girl and does display her pity when Wonder Girl breaks up with Robin, though she apparently dislikes the 80's in the said episode.
In spite of her upbeat characteristic, Bumblebee can still get enraged in certain occasions, such as in "The Bergerac" when the four other main Titans refuse to support Robin and when Beast Boy is about to pig out the picnic. This weakness of hers is further demonstrated in "Communicate Openly" when she originally fails to adjust her lifestyle to match with the other Titans and gradually causes her rage to pent up.
Physical Appearance
Bumblebee is a super heroine, whose attire consists of a sleeveless yellow & black turtleneck outfit (revealing her midriff), black pants, and built-in black boots. She also wears a yellow belt, arm band and golden hoop earrings. She has blue wings allowing her to be able to fly. Bumblebee also has her black hair into two buns, resembling space buns.
In "Forest Pirates", her appearance has changed quite a bit. She has become slightly shorter, has a bigger and rounder head with slightly different looking hair and no visible lips. She wears black and yellow wristbands instead of arm bands and is given yellow boots. Rather than having wings on her back, she wears a yellow pack in which her wings can appear at will instead.
Powers and Abilities
Bee Physiology
Shrinking: Bumblebee can shrink to the size of an actual bee.
Winged flight: She can fly using the bee wings on her back.
Bee Hive/Honey Generation
ElectricStingers: She has a pair of B-shaped "stingers" that can create powerful blasts of bright yellow, electrical energy that she can shoot at her enemies and can sting like actual bee stings. She is only seen with these in the comics.
Bee Hive/Honey Generation: She can create cannons from her hands that shoot bee hives filled with honey.
Bee Manipulation
Bee Manipulation: She can give orders to bees by whistling.
Bee Transformation: By consuming a large amount of royal jelly, she can turn herself into a queen bee.
She is also the first and currently the only female character from the original series to not have her voice actor return.
In the original series, Cyborg made Bumblebee the leader of Titans East when he left the team to return to his original team.
As of "The Viewers Decide", Bumblebee is tied with Aqualad for the most episode appearances of the Titans East members, with 26 counting cameos and flashbacks. She also holds the record for most speaking appearances of the Titans East member due to her becoming the sixth Titan.
She enjoys all girl slumber parties, and she also teased Raven about her crush on Beast Boy through a game of Truth or Dare, as seen in the Teen Titans Go! comic issue #12, titled "Sleep Over."
She probably tied her black hair to two buns because her buns resemble to a bee's antenna.
The outlines of her wings are white instead of light-blue in "Flashback".
Bumblebee is the only Titan who doesn't get reprise by an original voice actor.
Despite getting a redesign in "Forest Pirates", her original design is still used for her chibi form as shown in the opening sequence and "The Bergerac", as well as her toy form in "Collect Them All".
Bee Positive, bee confident, bee a leader! 
