What are some monsters that begin with the letter D?

Answer 1

Demons are one example.

A dhampir is a human-vampire hybrid.

A djinn and djinni another way of spelling Jinn, which is a supernatural creature in Middle-Eastern folklore. In the west we incorrectly spell them as "genies".

Dragons are large, reptilian beasts. The original mythical dragons were serpent-like, peaceful creatures which lived in the oceans and only attacked humans for defensive reasons. But western folklore adapted them into flying and fire-breathing monsters who are greedy and filled with hate.

A dryad is a nymph who inhabits a tree.

The dybbuk is an evil spirit in Jewish mythology.

A doppelgänger is a ghostly or supernatural double of someone. Though portrayed as supernatural by writers of the past before genetics were understood, it is rather common to have two people who look rather alike, usually a historical person and a current person.

Answer 2

A dinosaur, Demigod, Demon, Dhampir, Dragon, Dryder, Dryad, Dybbuk, Dwarf, and a Doppelgänger. (Pronounced Dopplegonger)