Chiko was a cat living in Dublith under the care of a young girl named Menny. Though Menny cared deeply for her cat, the pet's life ran down and she seemed to have died giving birth to her kittens. But, too young to fully comprehend the concept of death, Menny brought Chiko to the home of alchemistIzumi Curtis so as to have her repaired, where Izumi explained that a life is something that cannot be regained once it has been lost. In consolation, Izumi helps Menny fashion a grave for the beloved cat and lays Chiko to rest in peace.
In the 2003 anime, Chiko gave birth to a litter of kittens, and one had managed to precariously roll off of a rooftop that Chiko gave birth to them on. Ed used his alchemy and agility to rescue the kitten, which Menny cuddled at Chiko's grave while trying to come to terms with her loss.
Like Menny, Chiko was also cut from the 2009 anime.