Professor Hiiragi is a mad scientist who found a way to enter the Sixgate World, and the father of Rokuna. He recruited her and Mondo to protect him as he searches the Sixgate world for the items that will connects its magic to the human world, so that he can become famous. Generally he takes rules and morals a tad more loose than his companions and he's rather obsessed with finding the items.

Scientist Ichiroubei Hiiragi discovers the existence of Six Gates, an otherdimensional world full of monsters and powerful hidden treasures known as Mon Mon Items. Ichiroubei embarks with his daughter, Rokuna, and her classmate, Mondo. However, they're foiled at every turn by Count Collection and his assistants, who want the Mon Mon Items in order to conquer both worlds. Becoming the heroes known as Mon Colle Knights, Mondo and Rokuna join forces with the monsters, striking back against Count Collection while searching for the Mon Mon Items in the name of friendship between their worlds.<br><br>(Source: Crunchyroll)

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_Note: Not to be confused with the [animator](https://anilist.co/staff/143678/)._

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Guilherme Briggs has been working with voice acting since 1991. In anime, he made the Brazilian voices of [Mewtwo (Pokémon)](https://anilist.co/character/5113/Mewtwo), [Spike Spiegel (Cowboy Bebop)](https://anilist.co/character/1/Spike-Spiegel) and [Harry MacDowel (Gungrave)](https://anilist.co/character/1610/Harry-MacDowel).

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Mon Colle Knights, known as Rokumon Tengai Mon Colle Knight (&#20845;&#38272;&#22825;&#22806;&#12514;&#12531;&#12467;&#12524;&#12490;&#12452;&#12488;, Rokumon Tengai Mon Kore Naito Six Gate Far Away Mon Colle Knights?) in Japan, is an anime and manga series. The original concept was made by Hitoshi Yasuda and Group SNE. The series is based on Monster Collection trading card game. The manga, written by Satoru Akahori and Katsumi Hasegawa and drawn by Hideaki Nishikawa, is published in English in Singapore by Chuang Yi.<br><br>