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Billy looks like a normal eleven-year-old human boy. He has a large forehead, and black hair which is styled like devil horns. He has not aged physically for 5 years since his entrapment due to the halting of aging of any biological life that enters Dimension 12, meaning he still has the appearance of an 11-year-old boy.
Billy is a spoiled brat and is extremely jealous of Ben. He has a major superiority complex. He's also somewhat of a whiner and makes excuses for whenever he fails or cannot solve a problem. He is very conceited about his own so-called genius and does not think of any long-term or even short-term consequences of his actions.
Billy is also shown to be very impatient as he overloaded the remote for the Dimension 12 robots when they were moving a large object at a slow rate.
Billy is also best known for his unnaturally enormous ego. As shown when he was arguing with Captain Nemesis and Kangaroo Commando and didn’t even bother to hide his egotistical side when he agreed with Mazuma on renaming the Vengers to “Billy Billions and Friends”.
Billy first appears in Arrested Development, having Computron's minion robots attack Ben and Rook. At first, he is thought to be a fanboy, but is soon revealed as the cause of the chaos as the robots obey his commands. It is later revealed that Billy had been jealous of Ben during middle school, due to the attention he was getting while the so-called genius rich boy was generally ignored by his peers.
Unknowingly, Ben had gained Billy's ire as he tried to get rid of Ben with a dimensional transporter ray. However, Ben had transformed into Diamondhead at the time, which caused the beam to be reflected off his crystalline body and back at Billy. The result was Billy sending himself to Dimension 12. Due to the time-distortion effect of that dimension, Billy found himself stuck at the same age for the rest of his life.
After gaining control of Dimension 12's robots and eventually getting back to Earth, Billy used a De-Aging ray on Ben and Rook, transforming them into children. He then decided to get his revenge on all who had given him a hard time, but ended up causing an invasion of Dimension 12's robots, intent on wiping out all life. With the help of Ben and Rook, the invasion was stopped but Billy once again found himself upstaged by Ben and was arrested by the Plumbers.
In The Vengers, he teams up with Kangaroo Kommando and Captain Nemesis to take down Ben, and claim his place as protector of Bellwood. The new group quickly became popular, and after Billy heavily edited a video of his team's battle with Ben, combined with Will Harangue's propaganda, they ended up as the city's favorite superheroes. But before long, Billy was fighting with his teammates over the spotlight, which quickly turned into full-fledged warfare. Ben stepped in to stop their infighting, and Billy accidentally revealed he had distorted the facts about Ben and his team, which was broadcast live. This destroyed everything Billy worked for, and he was forced to leave the city.
Powers and Abilities
Billy has a genius-level intellect, specializing in robotics.
Billy is immune to time (and therefore cannot age), due to his extended stay in Dimension 12.
Billy invented a ray which can de-age a person to the level of an eleven-year-old, which was confiscated by Rook. He apparently built a replacement raygun which can transform into a Gatling turret in The Vengers.
Billy has a jetpack used for flight.
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Billy‘s obvious weakness is his massive ego and overconfidence.
Another notable weakness is Billy’s immaturity.
- Arrested Development (first appearance)
- Billy can been seen in a picture with Will Harangue in Return to Forever.
- In Ben 10,000's timeline, Billy is still the same size but he looks old and wrinkly.[DJW 2]
- Billy's hair style is very similar to Klarion the Witch Boy from DC comics.
- Billy is a parody of Richie Rich, who is also a very rich child who has a name that sounds like a form of riches, only they have a very different personalities (Richie is a rather nice kid who helps people, while Billy is a bratty kid who has a big ego).
- Billy is quite similar to Princess Morebucks from the Powerpuff Girls; not only are both of them rich and spoiled, they also both want to destroy the protagonists because of their extreme jealousy.
- Billy was unaware that Albedo, Fistrick and his gang, and the Vreedles had committed crimes either in or on his building until he noticed that the "B" had fallen off.[DJW 3]