necrophobe

It is important to note that while he is optional, defeating Necrophobe will cause the final save point on the way to the final boss to appear.

He gives kind words and advice to each party member, heals them, then sacrifices himself to defeat Necrophobe (though it is possible to defeat Necrophobe before Gilgamesh arrives, thus avoiding this scenario).

Shortly after this, Gilgamesh optionally returns (if the player touches the light and fights Necrophobe) and aids the party in their battle against Necrophobe, refusing to be remembered as a weak coward.

In Final Fantasy V, he is shown to be good natured, such as when he is seen to sadden upon hearing of Galuf Baldesion's death, as well as sacrificing himself for the party when fighting Necrophobe.