Choose a theme for the above poster.

https://www.youtube.com/watch?v=2z29Rk8814w

For the PvP warlock.
https://www.youtube.com/watch?v=bIoosTkOQWM
This springs to mind

https://www.youtube.com/watch?v=WybSSagVvoU
https://www.youtube.com/watch?v=B7mp2DMgHpI

It need 1 minute to build up and start
https://www.youtube.com/watch?v=-5qUjWwoX5c
https://www.youtube.com/watch?v=F70GICcUYEs
There is one song that all WoW human warriors fit and are fit by-
https://www.youtube.com/watch?v=byGNE08Wi3U
https://www.youtube.com/watch?v=0Ccpv3mz4HI
From the little snippets we've seen so far, and the small description you gave of Alexa's persona in the "would the above date your character" thread, I have a feeling this might suit somewhat ...

https://www.youtube.com/watch?v=Sg8Mzqgq_js

... at least, I feel it conveys the 'tude and the swearing aspect of things.
I can't link it, but from what I've seen Primadonna by Marina and the diamonds fits well with your char.
Draegoroth, on his way destroying all his opponents with his dark powers:

https://www.youtube.com/watch?v=0UbajWtCGmw

DARKNESS INCARNATE!
https://www.youtube.com/watch?v=Jh755R5ocIQ

Viking narrative notwithstanding, I find it relatively apt.
There can only really be one choice ...

https://www.youtube.com/watch?v=uGBvbrXNjs0

... honestly though, as of yet, I can't get too much of a proper feel for Rhythel in terms of stand out traits besides the hat, so all I can really add for the time being is a generic "Demon Hunter" kind of anthem ...

https://www.youtube.com/watch?v=_ir-jKSDZYY

... and this little ditty I feel would suit a Demon Hunter throw down.
https://www.youtube.com/watch?v=PvFjkijf0lo
https://www.youtube.com/watch?v=yJxCdh1Ps48
https://www.youtube.com/watch?v=CnmvheoF-cA
@ Daha

Daha probably thinks something like this is playing as he slowly walks into a room, everyone turns to look at him and they're filled with fear.

https://www.youtube.com/watch?v=aX2H9apT2BA

@ Ginylinn

From the little snippets we've seen so far, I'm going to go with this ...

https://www.youtube.com/watch?v=M3Iw-s2G824

... why? Well, cool, calm and collected Gnomish type with a gun, laying in wait, just biding her time until she can make that perfect kill shot. Repetitive, smooth, slightly futuristic sounding ... no pressure.
@Daha (figured someone ought to give him a slightly decent reply for some vaguely good post somewhere. I know, boo me later)
https://www.youtube.com/watch?v=UIyRXvHmXxo

Because well, it's Daha. He seems to be view himself as the 'Mad Max' of orcs, though in a more humorous (to us) way. The new Hope of the Horde as it were. He views many of us as 'mutants' - I mean come on, the parallels are clearly there lol.

@Ihriell
For the Blood Knight, there can be only one choice in my mind: https://www.youtube.com/watch?v=zPf_PJlJsJQ

A perfect match for the self-righteousness and beyond reproach style/attitude of the character. Specific version of the theme chosen because of a high level of contempt for the undead/fel users to the point where one might say that she underestimates them (from what I've seen anyway). I might speculate that she'd be all too willing to commit atrocities in the name of the Light, especially with such an apparent lack of emotions.

An untimely defeat against a supposedly inferior opponent is a predicted likely outcome, says this Kaldorei. The undead/fel users may be the most likely cause of her own mini-Vietnam debacle.
I can't link it, but a song called "The Lay of Nimrodel" seems to weirdly fit your character.. In some way...
https://www.youtube.com/watch?v=YanwyGP0Li4

Based on your history of posting here the character largely seems like a run-of-the-mill Warlock with some eccentric tendencies (perhaps due to being a Goblin?) and as such I feel that the above might be suitable - even if it might be a bit on the generic side of things.