I got this pretty recent meme from
(who actually got it from another friend). It's apparently a memory game where instead to matching the same pictures, you match the characters who share the same voice actor. You can do it with any shows, but I've gone with doing an all Nicktoons edition.
Row 1: Appa (Avatar: The Last Airbender); Waffle (Catscratch); Kimi (Rugrats/All Grown Up); Prof. Membrane (Invader ZIM)
Row 2: Dr. Wakeman (Teenage Robot); Trixie (The Fairly OddParents); Jeera (Tak and the Power of Juju); Happy (The Mighty B!)
Row 3: Carl (The Adventures of Jimmy Neutron: Boy Genius); Rhonda (Hey Arnold!); Keswick (T.U.F.F. Puppy); Ty Lee (Avatar: The Last Airbender)
Row 4: Almighty Tallest Purple (Invader ZIM); Master Tigress (Kung Fu Panda: Legends of Awesomeness); Plankton (SpongeBob SquarePants); Jack Fenton (Danny Phantom)
Row 5: Snap (ChalkZone); Shriek (CatDog); White Pantera (El Tigre: The Adventures of Manny Rivera); Boog (Fanboy and Chum Chum)
Row 6: Foop (The Fairly OddParents); Squidward (SpongeBob SquarePants); Mrs. Beady (Back at the Barnyard); Filburt (Rocko's Modern Life)
There aren't that many easy ones in this. I went with a few matches that might have you doing a Google search. One character in these matches hasn't even had their show premiere yet! That ought to keep you guessing! (HINT: I'm going by her SERIES voice actor, not the MOVIE one. And yes, I know it's only a "half-Nicktoon")
All Nicktoons are owned by Nickelodeon and their respective creators.