LogFAQs > #958121015

for fun, let's see how they're doing (some of these roles are subjective, so I put them where I thought they fit best)

Main characters:

Daggett Beaver (The Angry Beavers)
Tommy Pickles (Rugrats)
Zim (Invader Zim)

28.. Danny Phantom (Danny Phantom)
30.. Aang (Avatar: The Last Airbender)
38.. Spongebob Squarepants (Spongebob Squarepants)
48.. Doug Funnie (Doug)
50.. Korra (The Legend Of Korra)
58.. Norbert Beaver (The Angry Beavers)
53.. Luna Loud (The Loud House) [are all the Louds pretty much the main character? idk]
56.. Oblina (Aaahh! Real Monsters) [arguably she starts as the sidekick and later becomes the main character from what I remember so this could go either way]
64.. Otto Rocket (Rocket Power)
67.. Rocko Rama (Rocko's Modern Life)
68.. Lori Loud (The Loud House)
71.. Jimmy Neutron (The Adventures of Jimmy Neutron, Boy Genius)
72.. Dora (Dora the Explorer)
73.. Jenny (My Life As a Teenage Robot)
75.. Ren Hek (Ren and Stimpy)

Sidekicks to the main character:

Appa (Avatar: The Last Airbender)
Blue (Blue's Clues) [I know Blue is the title character but it's really about Steve]
Patrick Star (Spongebob Squarepants)
Skeeter Valentine (Doug)
Sokka (Avatar: The Last Airbender)
Toph Bei Fong (Avatar: The Last Airbender)

27.. Gerald Johanssen (Hey Arnold!)
31.. Heffer Wolfe (Rockos Modern Life)
33.. Arnold Shortman (Hey Arnold!)
40.. Sam Manson (Danny Phantom)
41.. Filburt Shellbach (Rockos Modern Life)
43.. Gir (Invader Zim)
44.. Snap (Chalkzone)
46.. Cosmo (Fairly OddParents)
59.. Wanda (Fairly Oddparents)
63.. Katara (Avatar: The Last Airbender)
69.. Chuckie Finster (Rugrats)
74.. Porkchop (Doug)

Main Antagonists:

Angelica Pickles (Rugrats)
Azula (Avatar: The Last Airbender)
Helga Pataki (Hey Arnold)
Swiper (Dora the Explorer)

32.. Plankton (Spongebob Squarepants)
45.. Ozu (Kappa Mikey) [I think? Never saw Kappa Mikey]
55.. Amon (The Legend of Korra)
57.. Vlad Plasmius (Danny Phantom)
60.. Zaheer (The Legend of Korra)
66.. Denzel Crocker (Fairly Oddparents)

Side antagonists:

Ed Bighead (Rockos Modern Life)
Ember McLain (Danny Phantom)
The Boulder (Avatar: The Last Airbender)
Ty Lee (Avatar: The Last Airbender)
Zuko (Avatar: The Last Airbender) [yes he later becomes the sidekick but for most of the show he's an antagonist! sorta]

42.. Box Ghost (Danny Phantom)

Looks like there's hardly anyone left that can be called a true main protagonist,

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Khal Kirby, warlord of the Super Star Khalasar
PSN/Steam: CheddarBBQ https://goo.gl/Diw2hs