Luna acts as the talking animal guide, a trope commonly seen in magical girl anime, for the sailor soldiers in Sailor Moon. She helps to gather intel on the strange appearances of villains and where their next target is. Luna initially starts her quest by finding and gathering all of the sailors.
Sailor Moon by Naoko Takeuchi
Unknown, “Luna,” The Museum of Fictional Literary Artifacts, accessed March 30, 2023, https://mfla.omeka.net/items/show/79.