Vampires

Vampires (吸血鬼 Kyūketsuki) are a race of exceptionally powerful beings who are immortal. In terms of raw power, it is unknown whether or not they are inferior or superior to Demons. However, they are known to have incredible powers without magic.

Description
Vampires, contrary to popular belief, are not weakened by garlic, holy crosses, and sunlight. Instead, they are actually drawn to these things, as they are considered "creatures of darkness", and most actually want to experience the feeling of "holiness". Vampires often share similar physical characteristics, one being that they all have at least one red eye. The other being that they have enhanced abilities, ranging from strength to pure wit and intelligence. Although they are technically immortal, they have one weakness. Should anyone stab a specific silver dagger through a vampire's heart, then they would die. However, one of the silver daggers is one of the Forbidden Weapons, and was illegally obtained by Ayato Harlyne, a vampire. And the other one's current holder is Eren Hakaisareta, so it is highly unlikely a vampire will die in this millennium.