Celebi, like Mew, is a very playful species in general. Celebi are extremely powerful despite their small size, another trait they have in common with Mew. Celebi also can be very timid, not wanting to show themselves despite their power. Although multiple Celebi have been seen at one time, it is unknown if they are different individuals or the same Celebi from different time periods. Therefore, it is virtually impossible to determine exactly how many Celebi exist. Celebi is also very protective of itself, its home, and the Pokémon living in it. For this reason, it has been referred to by some as a "Guardian of the Forest".