Who Created The Whole Thing?

There isn't a single person who created the thing as a whole, though Akahori Satoru was the most central regarding the anime.

Advertisements like to say that the anime is based on the card game, though this is as misleading as calling Digimon a Tamagotchi anime or Record Of Lodoss war an RPG anime. These anime do not feature people playing with toys in tournaments or rulebooks around a table, but people interacting with actual monsters and mages. As such, they are not sports anime, but fantasy adventure anime.

The proper etymologically correct phrase would be either Mon Colle Knights is based on the Six Gates World setting, or Mon Colle Knights is based on the world featured on the Monster Collection card game.

Group SNE : the company that owns the Six Gates franchise. They are fiercely protective of their work and will not allow any image of the cards to be online. They also regularly sweep Youtube early in the year to delete any MCK episodes.

Hitoshi Yasuda : created the Six Gates World and its magic system.

Akahori Satoru : created the anime's story and most of its characters.

Kasumi Hasegawa : helped created the story and did the composition of the series.

Atsuko Nakajima : designed the characters.

Loads of artists : created the monsters on the card game.

Yasunao Aoki : the director of the anime.