Moon

The Moon is (arguably) a character featured in The Legend of Zelda: Majora's Mask. In the game, the Moon was a puppet of Majora's Mask was was intended to crash into Termina. After possessing Skull Kid, the Moon was corrupted and ultimately pulled from its orbit around the game's world. As the game progressed, the moon would slowly but surely close in on Termina's Clock Town. On the third day, it would, though the game's protagonist Link managed to come in possession of an Ocarina that would start the three days over once he played a certain song on it.

While normally the moon has no face, Majora's Mask placed a curse upon it that possibly gave it its terrifying face that symbolized the impending destruction that was soon to ensue.

After travelling to four of the game's dungeons, Link managed to break the Four Giants free. The "four who are there" arrived just in time before the moon crashed into the planet and stopped it in its path. Link entered the mouth of the moon, as did Majora's Mask, and the two battled inside of it with Link becoming the inevitable winner.

Super Smash Bros. Melee
In Super Smash Bros. Melee for the GameCube, the Moon appeared in the background of the Great Bay stage. Here, the moon would start to home in on Termina though, as in the game, the Four Giants would come to the rescue and push it away. The moon itself had absolutely no effect on the fight.

Trophy Description
''High in the sky above the Clock Town Tower, a menacing moon slowly sinks towards the city. Shrouded in mystery and feared by all, it threatens to devour everything and everyone in a cataclysm of fire. Strangely, inside the moon is a beautiful, pristine plain broken by a single tree. The moon breaks after Link defeats Majora's Mask.''