Private Kaikaina Grif, also known as Sister, is the younger sibling of Dexter Grif. She is a Blue Team member who is color blind and has a lack of intelligence, a factor many of the main cast have noticed. After the events of the Blood Gulch Chronicles, Sister was the only soldier to continue to be stationed at Blood Gulch and has remained there ever since. She plays a major supporting role in Season 5 while appearing sporadically in later seasons.