Is Tsukune from Rosario-Vampire season 1 a vampire?

No, Tsukune from Rosario+Vampire season 1 is not a vampire.

He's a normal human who accidentally stumbles into the all-girls monster school, Youkai Academy. He gets mistaken as a vampire because of a quirk of fate and is eventually given the "Vampire Slayer" title as a joke by the school.