First of all I really want to communicate that “Energy Vampires” is a term not meant to dehumanise anyone but instead bring awareness to the archetypes of self absorption that - can manifest through us all at times. - anyone can tap into.
We all can be Energy Vampires at times, it feels good to be around others who lift us up and make us feel better.
Where this tips over in to someone becoming an “Energy Vampire” however is when self awareness and regard for others is lacking to such a degree it detriments the others they interact with.
Energy Vampires often fall on the “Self Focused” side of the spectrum that is mentioned in Energy Flows

Typically an Energy Vampire is not reciprocal in their connections with others, usually from being so focused on their own needs.
Energy Vampires are typically unconscious of their desire for your energy (or at least the effect they have on your energy).
Ultimately the key trait of an Energy Vampire is that they want your energy (Resources; Time, Money, Focus/Attention, Emotions, etc).
The degree of intensity in their interactions will be determined by two things:
(Increased delusion, lying, deception)
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(Increased motivation to prioritise themselves and likelihood of neglecting you in the process)
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The more disconnected from inner truth they are the more chaos they will bring (lies, manipulation, etc).
The more focused on their own needs, the less they will give thought to what is good for you (expecting more of your resources).
Their disconnection to truth will determine how far they will go to acquire said resources.