Can you prove otherwise?
Both forces are preety caothic on they’r own, and since fel magic and void magic are hostile to each other (the while point of the burning crusade was to make sure the void couldn’t corrupt a titan soul)
One Way this class combo would work Is if the visual of a DH were changed with void ones.
Demon form Is an void aberration (like the boss in HfC but more void elf’ish) and all the green abilityes are purple
As I said in this
The explosion part was exagerated of me, i find even myself guilty of that, but what i meant Is that both forces are very much against each other, something that could be really Dangerous for the wielder of both.
I forgot the void spells from the demon hunters, do they still exist or not?
If you ask me i don’t know 
Perhaps They do, but i’m not sure.
Same goes with Light against the Shadows that can’t be friendly to each others?
Yeah that way.
Could Void and Shadow and arcane be friendly to each others?
Void and Shadow are preety much the same thing, but Shadow Is a lesser version of void.
Void and arcane i don’t think They could mix that well.
Arcane Is order magic, titan’s magic, while void Is madness, against order.
A void Elf can call on arcane magic and fel, but They can’t absorb It, like demon Hunters, since the void in theyr veins would rebell to the arcane/fel/liht and hurt badly/kill/explode.
If you meant mixing arcane with void, i’m not quote sure, but It would Be preety bad MOST likely, knowing how void hates order and how order hates void and fel
At first: A warlock and a mage, are the ones that never bind anything themselves?
At second: Demon Hunters are bound to the fel magic, same with Felborne
I’m preety sure They learn how to twist the Power to Theyr will
Yes. even thought we don’t have any news about felborne being Alive ( but neither dead).
Even after the Legion’s defeat in Suramar, the Felborne continue to serve the demons and can be found on the Broken Shore. (source: WoW: Legion/WowPedia)
So the Felborne is still very much a thing.
I want to look like the Suramar NPCs. Please Blizzard.
So you trying to say I am ugly? 
The playable models for them is a downgrade. Jut look at Thalyssra and Valtrois.
Ok…ok… 
Just look at the difference.
You literally posted a Nightborne of 3 year old, we have been updated since…
https://imgur.com/a/U9sLLkf
https://imgur.com/a/WLP9sE6
https://imgur.com/a/5F6FAld
This is how we look right now.
Still not as good as the npcs.
Still better than those big eyed alien looking nightlelf cosplaying a Nightborne.