T.J. and the gang from Recess:

Slightly older versions of the skaters from Rocket Power:

Dee Dee, Dexter, and Mandark from Dexter’s Laboratory:

The whole cast of adult babies Rugrats:

(From left to right: Phil, Lil, Dil, Tommy, Chuckie, Kimi, Angelica, Susie)

Stan, Kyle, Cartman, and Kenny from South Park:

The whole neighborhood from Hey Arnold:

(Top row: Lila, Phoebe Helga, Sheena, Nadine, Rhonda
Bottom row: Stinky, Brainy, Gerald, Arnold, Eugene, Sid, Harold)

The Wild Thornberrys including a ridiculously hunky Donny:

PBS’ favorite disappearing couple:

And adult Powerpuff Girls with costumes that look actually pretty functional: