How do you say vampire in Japanese kanji?

The best equivalent is 吸血鬼　Which translates basically into "Blood sucking demon/monster"

Kanji: 吸血鬼

Hiragana: きゅうけつき

Romanji: Kyuuketsuki

Pronunciation: Cue-ket-ski

There's also ヴァンパヤ　Which is basically Vaanpiya or "Vampire" in English