Kabuto Ebizo

About
Kabuto Ebizo is a student at Hitsue High School. He is a stupid kid and he always fails his test. As you can see on the picture to the left, he is surprised he failed an English test about spelling two-four letter words.

The words he got wrong are:
 * hi
 * on
 * why
 * did
 * you
 * born
 * dumb

That clarifies why he is a stupid teenager.

Source
Cardfight Vanguard