While Ghost is an opponent in the games, it does not have animations or lines of its own while dueling - instead, all Ghosts are made to look exactly like other duelists, and use their same overworld sprites and in-duel phrases. In the japanese version, they also use their voice clips, although with a robotic voice filter applied. In the games, this is explained by Lazar to be functions added to Duelbots through a special series of programs, which Primo installs into the Diablo Duelbot army to further his plans.
While Ghosts are most frequently faced while they mimic the Sector Security officers Dean and Wade, they can take on the appearance of other people as well. A Ghost imitating Maia is faced during Tetsu Trudge's second story event in Tag Force 5, and another Ghost disguised as Lazar is seen during Primo's third story event in that game. Furthermore, two particular Ghosts impersonate Primo and Crow, and are faced in Tetsu Trudge's last story event in Tag Force 6.
Ghost is strictly a story-only character. Outside of story events, it cannot be encountered on the field, and it is not available for Free Duels. Gameplay-wise, it is also considered a separate character from those it imitates, disallowing them from using Ghost's Decks.
The regular Ghosts follow the same naming scheme for their Decks, it being "Diablo" (ディアブロ, Diaboro) followed by the first two characters in the impersonated individual's romanized name.
For example, Ghosts simulating the appearance of Dean use Decks titled "Diablo SA" (ディアブロＳＡ, Diaboro SA) - SA being the first two characters of Dean's japanese name, Kunimasa Sawanaka, if reading his surname first.
The Ghosts impersonating Primo and Crow use Decks titled ""Wisel Ghost" (ワイゼル・ゴースト, Waizeru Gōsuto) and "Blackwing - Ghost" (ＢＦ － ゴースト, Burakku Fezā － Gōsuto) respectively.