(Or what I see each part of brink "comes" from.)
[Oh and I don't mean to insult, this was just for fun and has been on my mind for a while xD]
Team Fortress 2 - Classes
QW:ET - Objectives
CoD - Experience Points
Borderlands - Weapon design
Mirror's Edge - hardcoe Parkour
???? - Character Design
PROFIT - BRINK
amirite?
also I think a bit of APB should also be mentioned
(remember, not implying BRINK is a huge thief, this was just for fun!)