Darth Plagueis(new saga reboot)

a wise and powerful sith lord muun, he was thought killed in his sleep by Darth Sidious only to survive via midi-chlorian manipulation. he survived order 66 and witnessed Luke and kalos heroic acts. when Kalo joined the dark side and killed Han solo his powers has grown too great for vader and the emperor. this prompted Plagueis to take Kalo in to nurse his fledgling powers and teach him the dark side in the "proper" way. he serves as a mentor for Kalo throughout episodes 5 and 6