Billy is the first monkey to enter F-Zero. One of his ancestors was a trained rocket pilot and the first monkey in space. Whether by genetic predisposition or not, Billy's ability as a pilot is truly exceptional, and he's the first monkey to enter the F-ZERO Grand Prix. He was raised in a special lab where he was educated in human literacy and communication skills. The lab concurrently developed an F-ZERO racer suitable for a monkey, and bestowed upon him the honor of piloting it in the Grand Prix.
His species seems to not be specially intelligent, since he himself was trained in a laboratory in linguistic skills and eventually to enter the F-Zero races. He's since competed for two years, though he has yet to win the Grand Prix.
When he is interviewed in F-Zero GX, Billy usually talks about money, such as how he became a racer "for the money."
In the anime, Billy is a member of Dark Million and later betrays them.
- In F-Zero GX, the character AiAi, from Super Monkey Ball appears on Billy's belt.
- He bears a slight resemblance to Andross and Andrew Oikonny from the Star Fox franchise seeing as they are monkeys. The only difference is their fur is white/grey.
|• • • • • • • • •|
|Introduced in F-Zero|
|Captain Falcon - Dr. Stewart - Pico - Samurai Goroh|
|Introduced in F-Zero X|
|Antonio Guster - Mrs. Arrow - Baba - Beastman - Billy - Bio Rex - Black Shadow - Blood Falcon - Dr. Clash - Draq - Mr. EAD - Gomar & Shioh - Jack Levin - James McCloud - Jody Summer - John Tanaka - Kate Alen - Leon - Michael Chain - Mighty Gazelle - Octoman - Roger Buster - Silver Neelsen - The Skull - Super Arrow - Zoda - Super Falcon (through cheat code)|
|Introduced in F-Zero: Maximum Velocity|
|Megan - Mickey Marcus - Jane B. Christie - Nichi - Lord Cyber - Alexander O'Neil - Blitz Wagner - Kent Akechi - Kumiko - Professor Yazoo Jr.|
|Introduced in F-Zero GX/AX|
|Phoenix - Princia Ramode - QQQ - Don Genie - Terry "Digi-Boy" Getter - Dai Goroh - Dai San Gen - Lily Flyer - PJ - Deathborn - Spade|
|Introduced in F-Zero: GP Legend|
|Rick Wheeler - Lucy Liberty - Misaki Haruka - Lisa Brilliant|
|Introduced in F-Zero Climax|
|Berserker - Clank Hughes - Death Soldier|