The main protagonists of the BioShock video game series (from right to left):
Jack Ryan from BioShock
Subject Delta from BioShock 2
Charles Milton Porter (aka Subject Sigma) from BioShock 2: Minerva's Den
Booker DeWitt from BioShock Infinite
Booker/Comstock from BioShock Infinite: Burial at Sea Episode 1
Elizabeth from BioShock Infinite: Burial at Sea Episode 2
All characters belong to Irrational Games, 2K Marin. Enjoy!