I was just looking over a pick i made about my favorite couples and I realized my FAVORITE favorite couples area all somewhat similar.
I've noticed also that shows tend to have similar characters on their shows (drama shows at least):
-every show has a deep connection couple: Lucas/Peyton, Ryan/Marissa, Buffy/Angel, Liz/Max,
-every show has a sweet or comic relief couple (that can be just as important as the deep ones, but they have a different dynamic): Summer/Seth, Brooke/Lucas, Buffy/Spike
-every show has random couples that don't mean anything in the long run and are just fillers in between meaningful relationships: Lucas/Lindsey, Lucas/Anna, Peyton/Pete, Brooke/Felix, Haley/Chris, Ryan/Lindsey Gardner, Marissa/Alex, Seth/Alex, Ryan/Theresa, Marissa/Volchok, Buffy/Riley, Meredith/any guy she brought home from the bar in her effort to get over Derek, Alex Karev/Nurse Olivia, George/Nurse Olivia, etc.
Also there is sometimes one solid couple that is always together: One Tree Hill (Nathan/Haley), The OC (Sandy/Kirsten), etc.