Callisto is the shyest moon of Jupiter, and possibly the oldest of Jupiter's Galilean moons! She's usually quite shy and timid. But whenever she does speak, she is not afraid of speaking her mind! She is also quite sweet and loving, not being afraid of receiving affection at all, even falling in love quite easily!  She has the most cratered surface of the Galileo moons, which also indicates her surface is the oldest as well. She is also the outermost of the Galilean moons as well!