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The student leader of the newspaper club.
Ginei is an accomplished photographer, although the ends to which he uses these skills are very questionable.
He appears first in episode five where Shizuka informs the squad (Moka, Kurumu, Tsukune, Yukari) that Ginei will be their leader. Anyone paying any attention will find it blatently obvious what kind of monster that he is on first sight, a werewolf. For those of you that need it explained, the necklace that he wears is a dead givaway.
Ginei actually is the antagonist of the fourth episode, in the form of a peeping tom that spies on EVERY girl in the school. Our first clue that he is the pervert is this: He orders Moka and Kurumu to hang some posters very high on a wall, then he crouches to get a clear view. When Tsukune calls him on it Ginei brushes it off onto Tsukune. Ginei then sets Tsukune up by telling him to look into a window that happens to be the girls shower room. Ginei photographs this and passes the incriminating photo all over the school. This infuriates both Kurumu and Yukari and they start an investigation... more on that later.
Ginei then finds Moka, who is sulking on the roof in a depressed state, and offers to "comfort" her. Moka rejects his advance and Tsukune arrives, prompting both Kurumu and Yukari to arrive with THEIR evidence. They both then proceed to shred the lie that Ginei had concocted.
With his ploy failed Ginei reveals his werewolf form against the vampire Moka, actually landing a few good hits due to the full moon empowering him with blinding speed. Of course, the clouds then cover the moon and vampire Moka kicks him off of the roof. Ginei, oddly, would have caught himself from falling, as he gracefully spun in midair and braced himself against the stone railing to leap back into the fray... the only problem was that the stone gave out.
From this point on Ginei takes more of a backseat to the action, coasting in and out of the picture. Mostly shown on the roof of the school with a teloscopic lens (any pervert can figure out why).
He appears to have some feelings for Ruby, later on in the anime, although this is really never built upon.