# Andrei

Defeat Andrei in level 1, and do not brainjack Goulnaba in level 2.
# Badelaire

Go left on the train tracks in the Lyon level, talk with Badelaire and brainjack him.
# Goulnaba

Brainjack Goulnaba in level 2.
# Lee Fei Shan

Enter the bazooka room in the Hong Kong level. Go up the stairs to the left and brainjack Lee Fei Shan.
# Marguerite

Successfully complete the Vienna level with Rumrod. Use the panel and defeat Marguerite.
# Rumrod

Brainjack Rumrod in the sewer area of the Amsterdam level.
# Sam Smith

Successfully complete the London level with Badelaire, then brainjack Sam in the tower.
# Shaja

Successfully complete the Taj Mahal level with Lee Fei Shan, use her memory to enter Shaja's room, then defeat him.
# Youthfu

Defeat Youthfu in the Mecca level.