Johan "Jesse Anderson" Andersen
About
Johan and the other exchange students debuted in the manga at the end of chapter 37, but it currently unknown what their role in the story will be.
Johan in the manga has a large interest in Insects, as shown when he first meets Judai and Sho. He also plays an Insect deck, however, he never really did anything of importance to the "plot" seemingly because the last volumes of the manga were rushed, so he wasn't fleshed out.
He is also shown at the special chapter, with different clothes (resembling his anime ones) watching Koyo and Judai's final duel.