Sou

ソウ

Sou is a sentient motorrad like Hermes. [Spoiler] Sou is found by Photo, an at-the-time unnamed slave girl who managed to escape her captors. Soon after this interaction, he tells her that she should live, rather than die like she wanted. The story flash-forwards several years and shows that Photo became a famous photographer, from which Sou took her name. [/Spoiler]