In the games
Bill is the talented and famous inventor. He invented Pokémon storage system and Time Capsule. People and himself call him Pokémaniac. He has a big collection of common and rare Pokémon. The first one he caught was an Abra. Celio is his old friend that knows lots about him. Bill has some fans like Pokémaniac Brent which calls to the main player with information about him. Bill has a big family. In Fuchsia City lives his adult sister and Bill's grandpa, which in Generation II keeps Bill's Cottage near Cerulean City while he is visiting his hometown, Goldenrod City where his mother and young sister live. His mother used to be a Kimono Girl and his younger sister can't wink. Bill can't stomach milk. In Japanese version Bill speaks in Kansai Dialect. Bill's favorite Pokémon are Eevee and the Eeveelutions, and he is fond of giving extra Eevee in his collection to friends.
In Pokémon Red, Blue, and Pokémon Yellow, Bill is found at the Cerulean Cape, initially performing an experiment on Pokémon teleportation. He, however, gets combined with the body of a Clefairy and requires the player's help to fix the problem. After things are back in order, he informs you about his Pokémon Storage System and the "Someone's PC" changes to "Bill's PC." He also gives you the Template:I, allowing you to board the S.S. Anne. Later in the game, you can visit part of Bill's family in Fuchsia City.
While visiting Lanette, players can check one of her computers to find an E-mail from Bill. This is the only time that he is mentioned in the game. However, no such mention is made in the Japanese version (not confirmed with Pokémon Ruby and Sapphire).
In Pokémon FireRed and LeafGreen, Bill is in the same area as in the original games. However, you meet up with Bill on Cinnabar Island after receiving the Volcanobadge from Blaine. From there, you go to the first three Sevii Islands and complete a short side story.
In the anime
Ash, Misty, and Brock meet Bill at his lighthouse in Mystery at the Lighthouse, his Japanse voice actor was Masaya Onosaka, his English voice actor was Maddie Blaustein and his Brazilian Portuguese voice actor was Marcelo Campos.
Bill had previously been trapped in a Kabuto costume for what he claims to have been hours until Ash finally comes to press the release button for him. Afterwards, Bill fulfills a request made by Professor Oak to give Ash and his friends a lesson on the basics of Pokémon, during which Bill shares the idea that there may be many more than just 150 species of Pokémon. The remainder of his appearance is spent focused on explaining to Ash and company his recent project, involving a mysterious Pokémon whose cry can be heard across the sea.
In the TCG
Bill appears on his own card in the Base Set . It allows the player to draw 2 cards from their deck. In the Neo Genesis expansion, he appears on a card called Bill's Teleporter, that gives the player of chance of drawing 8 cards. In the Expedition and EX: FireRed and LeafGreen expansions, he appears on a card called Bill's Maintenance.
In the manga
In the first chapter of How I Became a Pokémon Card, a younger Bill rescues a lost Dratini from an angry crowd and it lives with him for a couple of days, until its father, an angry Dragonite, begins to go on a rampage. Dratini returns home, promising to always be friends with Bill.
In the Pokémon Special manga
Bill is being dragged into all sorts of misadventures in almost every chapter ever since Red, Green & Blue when he is turned into a muttated Rattata by his experiments and snatched up by a Fearow in ...But Fearow Itself!, in this same round Bill offers to help Red with his Pokémon's storage problems, making allusion to his Pokémon Storage System. His other exploits including helping Red find and capture an Eevee that had escaped from Team Rocket; facing Lorelei in combat with Yellow; fighting alongside Lt. Surge against Bruno on the Cerise Island; and being attacked by a group of playful Staryu after meeting Crystal.
Bill not only designed the Pokémon Storage system, he also maintains it from his home, and is the one who repairs it after the Mask of Ice's Team Rocket sabotaged it, allowing trainers from all over to send their Pokémon to aid Red, Green, Blue, Yellow, Gold, Silver and Crystal in their battle against Ho-oh and Lugia. He also creates a portable Pokémon Transfer system using a PokéGear and a Pokédex, allowing Crystal to send Professor Oak the Pokémon she captured while the system was down.
At the end of Volume 15, he is showed working with Daisy Oak, and they seem to be getting along well, hinting at a possible relationship between the two, although there is never any solid evidence provided later.
His Pokémon include Vulpix (which he keeps as a guard "fox"), Magikarp, Exeggcute (which evolved into Exeggutor in the Sevii Island stories) and Farfetch'd. In the Japanese version, Bill speaks with an Osaka accent. However, as Osaka accent is impossible to render in English version, in English version he speaks with a Southern or Texan accent, which is commonly used when translating manga and anime to the similarity in perception of the two accents between the two cultures.
Bill being mixed with a Pokémon during a teleportation experiment seems to be a direct reference to the movie The Fly, in which a scientist experimenting with teleportation pods ends up combined with a fly.
Bill's name may be derived from Bill Gates, former head of Microsoft.
If a player declines to go to the Sevii Islands after defeating Blaine, Bill will wait in Cinnabar Island's Pokémon Center. During this period, he is both back at his home on Route 25 and on Cinnabar Island at the same time.
Professor Oak • Mom • Blue • Daisy • Old man • Bill • Mr. Fuji • Safari Zone Warden • Copycat • Primo
Pokémon Fan Club Chairman • Celio • Lostelle • Teala • Selphy • Cal • Steven Stone • Maylene • Cameron • Mr. Game
Team Rocket • Gym guide • Gym Leaders • Elite Four • Name Rater