My faves were - Adventures of Sonic the Hedgehog and Sonic the Hedgehog (the darker series which appeared after the more goofy Adventures of...). I loved Robotnik, for reasons still unknown to me.
I also watched - Teenage Mutant Ninja Turtles, Are you afraid of the dark?, Bailey Kippers POV, Stickin' Around, Kablam!, Looney Tunes, Ren and Stimpy, Rocko's Modern Life, Aaaah Real Monsters, Round the Twist, Doug and Rugrats. Predominently old school Nickelodeon shows, Nickelodeon now sucks so much in comparison to the early 90s.