Duplighost appeared in 2000 video game called Paper Mario. Duplighosts are ghost-like creatures that can take on the appearance, voice and abilities of other people. They first appeared in Paper Mario, and a single Duplighost was later featured in the sequel, Paper Mario: The Thousand-Year Door. To attack, Duplighosts can either fly into Mario, or turn into his partner. In partner form, a Duplighost's attacks are weaker, and changing takes up a move, giving Mario a better chance at winning the battle.