Io

"There are Gods and there are men. And there are those of us, who are in between. Many years ago, I refused a God's advance. I was cursed with agelessness. So much of a curse. I've lived for years watching my loved ones die. I imagine you're sympathetic to that plaint."

- Io to Perseus

Io is the deuteragonist in the 2010 film, Clash of the Titans. She is only mentioned in Wrath of the Titans and is portrayed by Gemma Arterton.

Background
Before the film, Io refused a god's advance and was cursed with agelessness. She watched many of her loved ones die while she lived on forever. She helped watch over Perseus since the day he was born and guided him to his family, but Io was too late in saving Danaë, Perseus' mother. She began watching him until the day he would finally rise up against the gods.

Physical appearance
Io is a young woman with long brown hair and brown eyes. She mostly wears her hair down or in a ponytail, and wears a white tunic along with a wrap that acts as a a cape and hood

Clash of the Titans
Instead of being a lover of Zeus like the myths, Io instead falls in love with Perseus, whom she watched since he was a child. At the end of the film, after Zeus resurrected Io, she and Perseus embraced each other.

Wrath of the Titans
Io gave birth to a son, Helius, and made Perseus promise not to let their son hold a sword.

She died in between the two films. Perseus hadn't contacted his father since their meeting and didn't want Zeus to resurrect Io.