One is a character who appears in Zero's Journey.
He is a brown dog with long ears, swirly hair, and a green scarf wrapped around his neck. When deceased, however, he shares a similar look to that of Zero, with a blanket-like body and a glowing aura.
Zero's Journey[]
One first appears in Mister Myzer's flashback, 10 years ago from that present time, where he playfully attacks his master and engages in a game of fetch with a worn elf toy. When his ball is thrown outside the window, however, One chases after it. He ends up in the street, distracted, before an oncoming Christmas vehicle runs him over, killing him on the spot.
One's death
While Mister Myzer expresses his anger and sadness for One's death, Zero uses his ghostly form to bring happiness and reminiscence to Myzer.