This is Jimmy Neutron the Boy Genius (And they say that he's the leader of Nicktoons too).
And these are the heroes who are similar to him:
Andros (Power Rangers in Space)
Arnold Perlstein (The Magic School Bus)
Arnold Shortman (Hey, Arnold!)
Ash Ketchum (Pokemon)
Batman (The Lego Movie and The Lego Batman Movie)
Bentley (Sly Cooper series)
Big Pete (The Adventures of Pete and Pete)
Billy Cranston (Power Rangers series)
Blake Bradley (Power Rangers: Ninja Force)
Blossom (The Powerpuff Girls)
Brody Romero (Power Rangers Ninja Steel)
Carter Grayson (Power Rangers Lightspeed Rescue)
Clemont (Pokemon)
Clifford the Big Red Dog
Cole Evans (Power Rangers Wild Force)
Damon Henderson (Power Rangers Lost Galaxy)
Danny Fenton (Danny Phantom)
Danny Zuko (Grease the movie)
Dexter (Dexter's Laboratory)
Dillon (Power Rangers: RPM)
Donatello (Teenage Mutant Ninja Turtles series)
Drew (Pokemon)
Drix (Osmosis Jones and Ozzy and Drix)
Edd (Double D) (Ed, Edd n' Eddy)
El Tigre/Manny Rivera (El Tigre: The Adventures of Manny Rivera)
Flik (Disney/Pixar's A Bug's Life)
Flint Lockwood (Cloudy with a chance of Meatballs series)
Franklin the Turtle
Fred Jones (Scooby-Doo series)
Hercules (Disney)
Hiccup Horrendous Haddock III (How to train your Dragon series)
Hiro Hamada (Disney's Big Hero 6)
Iron Man (Marvel universe)
Izzy Izumi (Digimon)
Izuku Midoriya (My Hero Academia)
Jack Landors (Power Rangers S.P.D.)
Jason Lee Scott (Mighty Morphin Power Rangers)
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Jason Lee Scott (Power Rangers (2017)
Jayden Shiba (Power Rangers Samurai)
Joseph Joestar (Jojo's Bizarre Adventure)
Jeremie Belpois Code Lyoko)
Joy (Disney/Pixar's Inside Out)
Justin Stewart (Power Rangers Turbo)
Kazuki Kazama (Samurai Shodown series)
Kenny McCormick (South Park)
Kenny (Pokemon)
Koichi Hirose (Diamond Is Unbreakable)
Kyo Kusanagi (KOF series)
Lazlo (Camp Lazlo)
Leo Corbett (Power Rangers: Lost Galaxy)
Lewis (Disney's Meet the Robinsons)
Lincoln Loud (The Loud House)
Lisa Simpson (The Simpsons)
Mack Hartford (Power Rangers: Operation Overdrive)
Mario (Super Mario Bros. series)
Max (Pokemon)
Max Goof (Disney Universe)
Megamind
Mickey Mouse (Disney universe)
Milo James Thatch (Disney's Atlantis the Lost Empire)
Nate Silva (Power Rangers Beast Morphers)
Nick Russell (Power Rangers: Mystic Force)
Noah Carver (Power Rangers: Megaforce and Super Megaforce)
Oh (Home)
Osmosis Jones (Osmosis Jones and Ozzy and Drix)
Otis (Barnyard movie and Back at the Barnyard)
Phineas T. Barnum (The Greatest Showman)
Pixel (Lazytown)
Prince Edward (Disney's Enchanted)
Ralphie Tennelli (The Magic School Bus)
Riley Griffin (Power Rangers: Dino Charge)
Rodimus Prime/Hot Rod (Transformers series)
Rudy Tabootie (Chalkzone)
Ryo Hazuki (Shenmue series)
Sam "Squid" Dullard (Rocket Power)
The Scarecrow (The Wizard of Oz)
Scoop (Bob the Builder)
Sherman (Mr. Peabody and Sherman)
Sheriff Woody (Disney/Pixar's Toy Story series)
Sora (Kingdom Hearts series)
Stan Marsh (South Park)
Susan and Mary Test (Johnny Test)
T.J. Detweiler (Disney's Recess)
T.J. Johnson (Power Rangers in Space and Lost Galaxy)
Tai Kamiya (Digimon)
Theo Martin (Power Rangers: Jungle Fury)
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Todd (Wayside)
Tommy Oliver (Power Rangers series)
Trent Fernandez (Power Rangers: Dino Thunder)
Trip (Power Rangers Time Force)
Troy Burrows (Power Rangers Megaforce and Power Rangers Super Megaforce)
Twilight Sparkle (My Little Pony: Friendship is Magic)
Tyler Navarro (Power Rangers: Dino Charge)
Valentino Calavera (Victor & Valentino)
Velma Dinkley (Scooby-Doo series)
Wade Watts (Ready Player One)
Wes Collins (Power Rangers Time Force)
Willow Ufgood (Willow)
Yugo Ogami (Bloody Roar series)
Zack Morris (Saved by the Bell)
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Zhao Yun (Romance of the Three Kingdoms)
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Zhang Bao (Romance of the Three Kingdoms)
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Zhou Yu (Romance of the Three Kingdoms)