Character Description
Bulma is first seen in Dragonball, where she is on a quest of gathering the 7 Dragonballs. During her quest, she runs into a young boy named Goku. First, the two struggle to get along, but ultimately, they form a life-long friendship. Bulma is known as a genius scientist, which she has proven on numerous instances, for example the creation of the Dragon Radar, her involvement with Capsule Corp, being able to figure out the complex blueprints of Android 17's design, as well as creating a perfect replica of the emergency remote control Dr. Gero used to shut down the cyborgs, if they disobeyed him. Bulma is mainly featured in a supportive role, but she has shown that she does like the thrill of a good adventure, as evident when she joined Goku's son Gohan and Krillin on a quest to obtain the Namekian Dragonballs, which led to a chain reaction of many dangerous situations involving her future husband, the Saiyan Vegeta, as well as the galactic overlord Frieza, who owned many planets throughout the Dragonball universe.
 Plot Involvement
DBZ - Vegeta Saga
Bulma's role in this Saga is minimal but she helps out where she can. After Raditz is killed she is able to decipher his scouter and even get it to display numbers, later she helps recover the Dragon Balls so that Goku can be brought back to life. She wisely stays away from the battle and watches it via Baba's Crystal Ball, and is devastated when Yamcha dies. Once the battle is over she and the others are faced with the task of recovering the survivors and also the bodies of those who did not.
DBZ - Frieza Saga
Bulma is dragged along to Planet Namek with Krillin and Gohan to look for Dragon Balls, being brought because she is the most scientifically minded and therefore can repair any problems that might occur in the ship. Much to her irritation she spends most of the time being left behind by Gohan and Krillin while they look for Dragon Balls and deal with either Vegeta or Frieza's soldiers. After several close calls Bulma manages to stay unharmed for the most part and is eventually transported off the planet thanks to a wish. Back on Earth Bulma agrees to let the Nameks live at the Capsule Corp while the Earth's Dragon Balls recharge, she even lets Vegeta stay too as he has no where to go.
DBZ - Garlic Jr., Trunks, & Android Sagas
The Z Fighters gather in an abandoned section of the mountains, all sensing that Frieza is approaching Earth. But before any of them can react a mysterious youth appears out of no where and challenges Frieza, and his father King Cold alone, even turning into a Super Saiyan. He quickly disposes of Frieza and King Cold and invites them all to wait with him for Goku to arrive back on Earth, knowing that he should arrive very soon. They wait and sure enough, Goku arrives. The stranger takes Goku aside and talks to him in private, then leaves after. Goku tells the others that he was from the future and had come to warn them all that in 3 years time two powerful androids will appear, stronger than anything they have ever faced. In preparation for the day, all the Z Fighters go about training.
Three years come and go, and the day finally arrives that the Androids are supposed to appear. Goku and all the others, with the exception of Vegeta, gather by the city Trunks told him the Androids first attack. Even Bulma is there, showing off her new son, Trunks, who she had with Vegeta. They wait and soon the time they were supposed to attack comes and passes, confused at first, they soon realise they can't sense the Androids because they are machinery and, as such, have no life energy. Forced to search the hard way, the group split up and search the city for the androids. Bulma waits behind, but is still determined to get a look at the androids so follows them later, arriving at the time Piccolo is fighting with #20. She recognises him as Dr Gero, a gifted scientist and tells the others this. Realising how dangerous the situation is, she returns back home to the Capsule Corp.
DBZ - Imperfect & Perfect Cell Sagas
Bulma spends this saga at the Capsule Corp but comes in handy on numerous occasions. After Trunks and Krillin raid Dr. Gero's laboratory and bring back blueprints and documents on the Androids, Bulma is find a weakness and build a deactivation device which she gives to Krillin to use, warning him that it only works within a small radius so he'll have to get close. Later she also helps repair Android #16 at Krillin's request and is also called by Trunks, Gohan and Krillin as they find the existence of another Time Machine and a strange egg casing inside. They have no idea what it is and are unable to identify it.
Once the Cell Games begin she watches them from home, as they are broadcast on the TV, awaiting everyones safe return.
DBZ - Babidi & Majin Buu Sagas
Seven years have passed since the battle with Cell. Bulma is living peacefully with Vegeta and their son Trunks is now 8 years old. As Gohan enters High School in the nearby Satan City but still wants to be able to fight crime, but not wanting his identity known by his classmates he comes to Bulma for a solution. Bulma invents Gohan a costume for Trunks that he can transform in and out of at will.
Time passes and Gohan tells them of the World Martial Arts Tournament being held soon and that he's going to enter. From Other World, Goku communicates with them, saying that he is allowed to come to Earth for one day and will arrive the day of the tournament. Everyone prepares for the day and decide to enter too.
Eventually the day arrives and everyone gathers at the tournament to meet Goku. This year a new Youth Division is in place, much to Trunks' disappointment, he and Goten must fight in the Youth Division and not with the adults. Unsuprisingly, Goten and Trunks make it to the final round, they're battle drags on and despite their earlier agreement to not transform into Super Saiyans, bth of them break this rule. Trunks is eventually the winner, and gets to fight Mr Satan in an exhibition match.
Bulma and the others who aren't competing, wait for the main event to start in which Goku, Gohan, Vegeta, Krillin, Piccolo and Android 18 will be fighting. Krillin easily defeats his opponent, and next up is Piccolo.
DB GT - Black Star Dragon Balls Saga
When Goku tells Bulma about the situation with the Black Star Dragon Balls, she sorts out a spaceship for Goku to use to travel into outerspace and retrieve the Dragon Balls. However, on takeoff part of the tracking machinery comes loose, meaning that they won't be able to communicate with Goku, Trunks or Pan whilst they are on their mission.