Daichi Kobayashi

Daichi Kobayashi is Nanoha Fujiwara's best friend, simply known as the childhood friend of Nanoha, due to his friend's past years.

He doesn't like algebra a bit, but he simply likes in his variables and his "terrible" days in his least favorite subject, geometry.

He seriously likes Nanoha in a mix of mistakes, because he likes her when they grew up.

He knows his most favorite friend, Cute Decimal, his childhood friend since age 5. He remembers the robot when her owner created her, and then he likes her a lot, not more than Nanoha.