Jon Talbain, known as Gallon (ガロン Garon) in Japan, is one of the original playable characters in the Darkstalkers series, debuting in Darkstalkers: The Night Warriors (known as Vampire: The Night Warriors in Japan). He has appeared in every game since with the exception of Vampire Savior 2, from which he was omitted along with Rikuo and Sasquatch. Jon is a werewolf that has learned martial arts to retain his humanity over his primal instincts.

Outside of the Darkstalkers series, Jon has made cameos in Pocket Fighter and Capcom Fighting Evolution. He appeared in the American Darkstalkers television series, and has made several appearances in UDON's Darkstalkers series of comic books, in which he had his own standalone side story, "Talbain's Bane." He is also notable in Vampire Savior: The Lord of Vampire (Darkstalkers 3) for having to face the unique character called Dark Talbain, a sinister version of himself.

Jon is one of the characters that had their name originally created by Capcom USA, but was changed in Japan as a result of Capcom Japan feeling that the name would be seen as strange to the audience. When referring to the original name, some Japanese websites render it as ジョン・タルバイン (Jon tarubain) in the language.