Any kind of show featuring police, detective work, or mystery - from the serial killers Dexter and Hannibal, Bones the forensic anthropologist, to comics and comedies like Marvels Agent's of SHIELD, Chuck, and Brooklyn Nine-Nine.
The shows I watch the most and more than once. These shows are current and canceled and have watched many times.
During a current shows break I'll watch a season just to hold me over till it's back on. Some of these canceled shows I watch once a year.