Interesting, as I also understand it from a classical Greek perspective. Homer calls Aphrodite in the Illiad a “Daimon”, and it is sometimes used to refer to other Gods as well. However, going from Socrates and Plato, the Greeks did not consider the Gods to do any bad or cause any misfortune.
We also see the word used for the Personal Daimon, who is also called the Genius Spirit or later on the Angel of the Nativity. The ancient Greek poet Menander says this of the Personal Daimon:
“At birth a daimon stands by each man, the good mystagogue of life; for one should not believe
that there is such a thing as an evil daimon which harms one’s life, or that God is evil-rather He is entirely good. Those who have an evil character create many conflicts in their life and show their stupidity in all things, and lay the blame on their daimon and speak ill of it, although they are themselves to blame.” (Menander, Fr. 714 trans. Korte-Thierfelder, as found in: Frederick E. Brenke, ‘A Most Strange
Doctrine: Daimon in Plutarch’)
He says this as there was a belief going around that one either has a Good Personal Daimon or an Evil Personal Daimon. Interestingly, such an idea was also adopted by the Medieval Norse, as Snorri says in his Prose Edda that the Norse believed that either a good Norn is assigned to a person at birth, or an evil Norn, and this is the cause of their misfortune throughout life.
So, we see a belief in either good Daimonae or evil Daimonae, but not that they can be mixed. And of course Menander here suggests they are only good, similar to the Gods.
So where do you get the idea that Daimonae in the Greek context wield both benefic and malefic powers?