Fuyuki Hinata is a main character in Sgt Frog Abridged. He is a lovably stupid school boy who likes befriending aliens. He is prone to the bizarre one-liner, and on more than one occasion has acted downright insane.
Fuyuki gets along with everyone in the series. He is arguably closest to Keroro, who has been shown to genuinely care about Fuyuki. In Episode 13, he became Alisa Southerncross's boyfriend, though they haven't interacted since.
Fuyuki's voice and occasional over-the-top demeanor is a result of Thorn making fun of child voice actors auditioning for various Sgt Frog projects around YouTube. By Season 2 this was toned down considerably.