Eguchi, Meijin

Meijin appears to be an expert on net navis, given that he created Heatman. Dressed in a large white lab coat and wearing stylish glasses, this somewhat nerdy figure possesses the ability to create some of the most powerful navis ever. Following the conclusion of Season 2, Meijin joins Netto's father, Yuuichirou Hikari, at the Science Labs, where they collaborate.
Meijin has a few amusing and distinct quirks. First, he refuses to have -san attached to the end of his name, a fact Netto constantly forgets. Consequently, whenever Netto calls out "Meijin-san!", Meijin invariably replies with "-san wa iranai!" ("no need for -san!"). Fansubs may translate this as "Formalities not needed!", which is also sensible. The -san suffix denotes respect for someone older. In Meijin's case, he wishes to avoid appearing "old".
In Axess, we discover that Meijin is also a dedicated collector of small toys, specifically mini cars. It is quite amusing to see Meijin foaming at the mouth alongside Netto when a new batch of mysterious toys arrives in a box at the store.
Finally, Beast reveals that Meijin does indeed have a "significant other"... or at least he used to. He remains quite friendly with his ex-girlfriend, Makoto Aoni, and as the series progresses, they end up working together more frequently. These two science geeks seem rather perfect for each other.
Meijin's name is a pun on the -real- Meijin, a game story developer for the EXE series. "Meijin" (meaning "Master" or "Expert" in Japanese) is merely his nickname; his real name is Masakazu Eguchi. Regardless, you will frequently see the "real" Meijin dressed in the current attire of the "character" Meijin at Japanese EXE events.