Saw people posting their fav series so here's some of mine:

-Mario
-Sonic
-Crash
-Spyro
-Rayman
-Sly Cooper
-Jak & Daxter
-Ratchet & Clank
-Psychonauts
-A Hat in Time
-Banjo Kazooie
-AntonBlast
-Pizza Tower
-Elder Scrolls
-Dragon's Dogma
-NiGHTS
-Invader Zim
-Digital Circus
-Rocko's Modern Life