Transformers (Was my obsession for MANY years)
He-Man (By the power of Grayskull!)
Power Rangers (Oh god I loved this, until it was canceled due to teaching kids to beat each other up)
TMNT, the original series
Beast Wars (not as good as the original Transformers, but I loved it nonetheless)
Swat Kats (I loved it, too bad it was reruns all the time)

These are the ones I most fondly remember, there were many many others I loved, but those are the best ones

*nods*