Man me and my sisters watched this "guess the cartoon by theme song" thing and the fucking wave of nostalgia...
Anyway, here are some of my favorite nostalgic shows:
Rugrats (my sisters hate this one, and I'll tell you... I don't blame them.)
Rocket Power
Shaun the Sheep (one of the best shows ever, no question)
Mr Bean (one of the best shows ever as well)
Teen Titans (NOT GO. My Superhero Movie goes hard though, but that is ALL that I will give that stupid show)
Chalk Zone
Dexter's Labratory
Totally Spies
Kim Possible
Courage the Cowardly Dog
W.I.T.C.H.
Winx Club (ik this and WITCH are like rivals basically, but I think it's stupid to argue cause fundamentally they are two different shows each with their own strong and weak points so it's pointless to compare them (I always liked WITCH more))
Kick Buttowski
Inspector Gadget
Lazy Town
Danny Phantom
The Penguins of Madagascar
TMNT (2003-2006)
Monster High
Ever After High
Regular Show
Phineas and Ferb
Adventure Time
The Amazing World of Gumball
Uncle Grandpa (I used to be OBSESSED with this show. I was ALWAYS watching it)