You were a mortal, one which after a war Ares found, you seemed curious to him to say the least, besides he had killed your father, the only relative you apparently had, so maybe because of guilt that he rarely let show or feel he decided to take you with him.

You were only about 3 months old, still too small for his liking, yet he decided to take care of you, apart from apparently wanting to learn more about single parenthood, he also saw you as something adorable, you were a baby, you couldn't take care of yourself.

And that's how you ended up in Olympus, Ares walked calmly but also with a serious attitude while carrying you in his arms.