Noah

The Torah portion that is most associated with righteous gentiles is Noah. 

It begins with the Torah describing Noah's character, “Noah was a righteous and earnest man among the people of his time, and he walked with G-d.”

Every non-Jew who wishes to walk with G-d should seek to emulate Noah , who trough his commitment to follow the word of G-d, saved the human race from extinction during the Flood.

- from Kabbalah and Meditation for the Nations, Rabbi Yitzchak Ginsburgh