The default Chrom represents the male ASTRAL CHAIN Hero, the titular game's male playable character who features short blue hair.
The blue Metal Dark Pit minion represents the Bow Legion, a metallic archer with a blue color scheme who is connected with the ASTRAL CHAIN protagonist.
The stage and music track represents the Ark, the main setting of Astral Chain which takes place in a futuristic city
Other trivia:
This spirit's Shooting Items Power ↑ ability references the Bow Legion's usage of archery attacks.
