The Anime Amazing Race 22

Those characters are from different cartoon shows:

From "Digimon":
Tai Kamiya (Seasons 1, 2, 6, and 7)
Andrew Horne-Kamiya (Fan-Made)
Sora Takenouchi (Seasons 1, 2, and 7)
Mimi Tachikawa (Seasons 1, 2, 6, and 7)
Kari Kamiya (Seasons 1, 2, and 7)
Yolei Inoue (Season 2)
Henry Wong (Season 3)
Janyu Wong (Season 3)
Takuya Kanbara (Seasons 4 and 6)
Koji Minamoto (Season 4)
JP Shibayama (Season 4)
Koichi Kimura (Season 4)

From "Beyblade":
Kai Hiwatari (Seasons 1-3)
Saori Hiwatari (Fan-Made)

From "Babar":
Pom
Periwinkle

From "Teenage Mutant Ninja Turtles":
April O'Niell
Irma Langinstein

From "Octonauts":
Peso Penguin
Shellington Sea Otter
Dashi Dog
Tweak Bunny