The Mu is an enemy in Final Fantasy Crystal Chronicles: Echoes of Time. Appearing as small, squirrel-like creatures, Mus erupt from the ground and attack with swings of their tails. Although the common Mus first encountered by the party are extremely weak, advanced strains can be problematic with their burrowing capabilities; when they emerge from the ground, nearby allies are stunned. The first variation of Mu encountered, regular orange Mus have no defining characteristics other than their extremely weak statistics.
Mu is the name of a fictional continent that was once believed to have existed in one of Earth's oceans, but disappeared at the dawn of human history.