Initially, Northstar was a flying speedster who only generated light while in contact with his twin sister. After she had her powers altered to generate light independently, Northstar and Aurora found they cancelled each other's powers out in Alpha Flight #28. In #50, she saved his life by casting her light into him, allowing Jean-Paul to generate light while rendering her powerless. Northstar returned the favor in #85. After Aurora went through further changes, they could touch without any effect as of #104.