Arale Norimaki (則巻アラレ, Norimaki Arare) is an android built by Senbei Norimaki, known for her naïvety, energetic personality, lack of common sense and unbelievable superhuman strength but ironically she is nearsighted and needs to wear glasses. Senbei's mission is to convince the other citizens of Penguin Village that she is no more than a typical girl, which they appear to believe in spite of them taking notice to numerous displays of her superhuman capabilities.
Arale Norimaki was created in the laboratory located in the house of Senbei Norimaki. When she was first brought out into the outside world around the town of Penguin Village, she was introduced to Aoi who was the manager of a cafe called the coffee pot. Their Arale was given the identity of being Senbei's younger sister to hide the fact that she was an android.
The next day became Arale enrolled into Penguin Village Junior High School to fit in with the other kids after meeting the Headmaster. Her teacher was Midori Yamabuki who was Senbei's dream girl. In class she was sat next to Akane Kimidori the rebellious younger sister of Aoi. While Arale shocked everybody at the school on her first day with her intelligence during class and strength during P.E. At the end of the day she followed Akane who was meeting up with Taro Soramame and his younger brother Peasuke. Not knowing Arale's power Taro tries to intimidate Arale but she easily destroys a tree in front of them making them scared and gain respect for Arale as their friend.
Arale became popular enough at Penguin Village Middle School to the point that every club in the school wanted her but she ended up being to good for all of them but she eventually joined Akane's club the Sukeban Deka Fan Club.
After Senbei finishes working on a time machine named Mr. Time, he shows it to Arale who accidently gets transported through time. After spending some time in the past she transports back to the present proving Mr. Time to be a success.
Arale, Peasuke and Senbei watching the prehistoric egg hatch
Afterward the Time Slipper was successfully tested, Arale goes on a journey with Senbei and Peasuke to the prehistoric ages to capture a Dinosaur. While their Peasuke's prehistoric ancestor gives them a mysterious egg in exchange for Senbei's lighter. When they return to the present the egg hatched it turned out to be a strange baby with wings instead of a dinosaur. Arale named it Gadzilla or Gatchan for short after convincing Senbei to keep it.
The next day Arale and Senbei decided to find out how they are going to deal with raising Gatchan. Arale found out that Gatchan eats metal. When Arale threw Gatchan really high on accident while playing with it, it fell into the ground revealing that Gatchan can survive that. Later that night in the bath, Arale and Senbei discover that Gatchan had wings.
Arale rescues a Bear that was kept in a small cage by an abusive owner. Arale brought the bear to Senbei where they both worked at getting the Bear back in shape for taking him out to the wild. Once they brought the Bear back to the wild, it got hunted by a hunter getting Arale mad and attacked the hunter knocking him far away. Arale saves the bears life by donating parts from her body and having Senbei convert the Bear into a cyborg making him super strong like Arale. Arale gets a new body made later on.
Arale and Gatchan were taken aboard King Nikochan's Spaceship one night. While on the ship Arale met King Nikochan the king to an evil alien race called the Nikos and his assistant. Arale insulted King Nikochan because of his funny looks and didn't take anything he said seriously. After they destroyed Mars to try to get her attention, she was too busy messing around with Gatchan so when the Nikos were getting the laser to destroy Earth next the ship got eaten by Gatchan which saved the planet. Arale and Gatchan decided to rescue the Nikos by flying them to Earth's atmosphere to Penguin Village. Arale introduced the Nikos to Senbei where he built them a vehicle, but since Senbei didn't know they were aliens he built the Nikos a car instead of a spaceship and were stranded on Earth.
Arale makes several appearances during the General Blue Saga of the Dragon Ball manga and anime, debuting in the anime's 55th episode "Penguin Village", and making her first Dragon Ball manga appearance in "Chased to Penguin Village!", the 81st chapter of the manga. She and the Gatchan proved able to ride the Flying Nimbus, indicating that they are pure of heart.
In the remake of the Dr. Slump anime, Arale was originally going to be a sexy blonde teenage house maid but lightning hit Senbei's house causing his machines to malfunction and ends up creating her as a weird nearsighted little girl with super powers instead. Arale's appearance was changed by her hair being brown instad of purple. While Senbei went out to get clothes for her Arale, She ran around Penguin Village destroying several buildings.
Her name is a pun on the Japanese word for a small senbei.
Over the years of the series run, Arale shrinks and looks a lot more younger.