1 CatDog (CatDog)
CatDog is an American animated television series created by Peter Hannan for Nickelodeon. The series depicts the life of conjoined brothers, with one half being a cat and the other a dog.
How is CatDog creepy? I think Dog is adorable! - IceBearRules
I don't really get how they're scary (unless if you were scared by conjoined animals then I completely understand).
He isn't scary honestly - PeeledBanana
2 Pool Spirit (Are You Afraid of the Dark?)
I'm seriously surprised this was allowed on children's television.
This was incredibly terrifying another honrable mention Zeebo the Clown from the Tale of Laughing in the Dark. - egnomac
3 Hama (Avatar: The Last Airbender)
Oh lord I don't want to be reminded of her.
What how is this on Nickelodeon? Is this even a kids show? This left me triggered.
4 Josh Redgrove (Mr. Meaty)
This show had horrible character designs! - Phillip873
5 Ren (Ren & Stimpy)
If you count the horrible adult party version then yes. - Phillip873
Don't let that smile fool you, kids!
He can really go crazy when Ren loses his temper.
"AND with THESE hands, I hold the FATE of MILLIONS...they think he's a GOD...BUT HE'S AS MORTAL AS WE...I KNOW! " - xandermartin98
6 Super Shredder (Teenage Mutant Ninja Turtles 2012)
Seriously? Lola Loud? This thing is what nightmares are made of! - 445956
7 "Big Boy" Pickles (Rugrats)
Even worse than I'm Not Tommy!
8 Koh (Avatar: The Last Airbender)
9 Arnie (Hey Arnold!)
Just watch the episode Arnold Visits Arnie. - egnomac
10 Not Tommy (Rugrats)
In the episode Chuckie has a nightmare where he sees a character who he thinks is Tommy only for this monstrosity to appear instead and says in a very creepy voice "I'm not Tommy". - egnomac
11 Eugene H. Krabs (Spongebob Squarepants)
Eugene H. Krabs, or simply Mr. Krabs, is a fictional character in the American animated television series SpongeBob SquarePants.
In one episode, he scared Plankton to suicide because of his selfish trick.
12 Zeebo the Clown (Are You Afraid of The Dark?)
Scary as hell. This was really scary this episode. - Catasquote
13 Dan Phantom (Danny Phantom)
Dan Phantom is a fictional character in the American animated series Danny Phantom created by Butch Hartman for Nickelodeon.
He literally kills his own human half upon his creation. Granted, it was off-screen, but just imagining what it was like really brings out the nightmare fuel in how brutal and even graphic Dan Phantom's actions were. Speaking of his creation, that's another thing that's scary... - ModernSpongeBobSucks
14 Volcano Sauce Drop (SpongeBob SquarePants)
"Heheheheheh! By the powers of naughtiness, I command this particular drop of hot sauce to be really, really HOT! "
Okay, this one-shot character seriously needs to be higher! - ModernSpongeBobSucks
15 Rocko (Rocko's Modern Life)
Rocko is the eponymous fictional character of the cartoon Rocko's Modern Life and the comic book series of the same name.
16 Parker Dinkleman (Mr. Meaty)
17 Lola Loud (The Loud House)
Lola Loud is a fictional character from The Loud House and the third youngest child of the Loud Family and Lana's younger twin sister, Lola is arrogant, smart mouthed, spoiled, and is a tattle-tale, like Lori despite her selfish behavior deep down she's compassionate, she shares a room with her twin ...read more.
18 Cyclops (The SpongeBob SquarePants Movie)
19 Gorilla (Spongebob Squarepants)
Oh, who can forget this one? - 445956
20 Krumm (AAAHH!!! Real Monsters)
21 Zim (Invader Zim)
Zim is the titular protagonist and anti-hero of the American animated series Invader Zim, created by Jhonen Vasquez for Nickelodeon.
22 Mr. Friend (Rugrats)
23 SpongeBob SquarePants (SpongBob SquarePants)
SpongeBob SquarePants is a fictional character and the titular character and protagonist of the American animated television series of the same name.
24 Patrick Star (SpongeBob SquarePants)
Patrick Star is a fictional character in the American animated television series SpongeBob SquarePants. He is voiced by actor Bill Fagerbakke, who also voices numerous other characters on the show . Created and designed by marine biologist and cartoonist Stephen Hillenburg, the series creator, Patrick ...read more.
25 Ghastly Grinner (Are You Afraid of the Dark?)
26 Lincoln Loud (The Loud House)