Azuregos was a grumpypants because his research to reunite with his Spirit Healer girlfriend isn’t working.
And Senegos died after a long life in service of the Blue Dragonflight.
The irony is that Senegos will probably go to Bastion and meet Azuregos’ girlfriend, while Azuregos himself, being selfish as heck, probably won’t ever see her again lol
Funny you should mention them as I was posting a suggestion in the AI Character Art Thread that someone make Art of them and every other major Arcane Character such as Kalecgos, Anveena, Tyrygosa, Malygos, Sindragosa, Saragosa, Keristrasza, Haleh, Medivh, Aegwynn, Alodi, Khadgar, Jaina, Rhonin, Antonidas, Thalyssra, Azshara and Norgannon.
Arcane Characters are so interesting…
Khadgar, Jaina, Rhonin and Antonidas as leaders of Dalaran City of Mages are seen as embodiments of Arcane Energy.
First Arcanist Thalyssra is also seen as an embodiment of Arcane Energy by the fact of her first name…
The Guardians Medivh, Aegwynn and Alodi are seen as embodiments of Arcane Energy due to being infused with an entire Council of Archmagi’s Arcane Magic.
Queen Azshara by virtue of being the greatest Mage in WoW’s known history is also seen as an embodiment of Arcane Energy…
Blue Dragons are seen as embodiments of Arcane Energy…
Malygos and Kalecgos by right of being Aspects of Arcane Magic are even more seen as embodiments of Arcane Energy…
Anveena is a literal embodiment of Arcane Energy…
Norgannon the Titan of Arcane Magic is seen as an embodiment of Arcane Energy…
So many contenders of being the embodiment of Arcane Energy with some having more right to the title than others.
On the matter of the thread… Irony indeed that Senegos earned a place in the world of Azuregos’s beloved while Azuregos denied himself that place due to his selfishness and ego…
Dragons usually go to their own unique afterlife that has a collosal world tree that eclipses all others — G’hanir 
However from what I wrote as per above, I wouldn’t be surprised if the Spirit Healer girlfriend of Azuregos could go there (Realm of G’hanir) – As all winged beings are welcome to G’hanir. 
… That being said, IIRC some Spirit Healers weren’t of Bastion – They were the transformed Val’kyr of Odyn, those of who had broke free of his control & dedicated themselves to guiding souls to the afterlife, provide them the opportunity to find their body & awake from the brink of death or directly returning them to life. I’m sure if she’s one of those, she could just pop to visit her favourite palls whenever she sees fit 
What do you mean one my many husbands has a girlfriend? I’ll allow it… for now.