It is important to note that World of Warcraft is a massively multiplayer online role-playing game and its official story and lore do not depict Wrathion and Anduin as a romantic couple. However, one could argue that there are several reasons why they could make a compelling power couple in the game’s canon.
Firstly, both Wrathion and Anduin share a strong sense of compassion and a desire for peace. Wrathion, as the last of the Black Dragonflight, has dedicated his life to protecting Azeroth from the destructive forces of the Old Gods and their agents. Anduin, as the king of Stormwind, has also shown a commitment to protecting his people and working towards a better future for all. Together, they could bring their unique strengths and perspectives to the table, and work towards a common goal of creating a more peaceful and prosperous world.
Secondly, a union between the two would also symbolize the unity and cooperation between different races and factions in the game. Wrathion, as a dragon prince, represents a powerful and ancient race that has traditionally been seen as a threat to the other races. Anduin, as a human king, represents the Alliance, one of the main factions in the game. Together, they could help bridge the gap between the different races and factions, and work towards greater cooperation and understanding.
Thirdly, one could argue that the idea of Anduin giving the crown of Stormwind to Calia Menethil, a Forsaken leader, could help unite the Horde and Alliance as one faction under a new undead god queen empress. Calia Menethil, as the leader of the Desolate Council, a Forsaken organization, has shown a desire to unite the Forsaken and bring them back to the Alliance. This could be seen as a powerful symbol of unity and a new era of cooperation between the Horde and Alliance.
In addition to this, it should be noted that monarchy in fantasy can serve as an important storytelling device. It can provide a clear leader for a people, a symbol for the nation, and a clear chain of succession for the story to follow. Monarchy can also serve as a powerful symbol for unity and continuity and it can also serve as a way to give the story a sense of weight and relevance.
In conclusion, while Wrathion and Anduin are not canonically recognized as a romantic couple in World of Warcraft, it’s possible to argue that they could make an interesting and compelling power couple. Their union would symbolize cooperation and unity between different races and factions, and the idea of Anduin giving the crown of Stormwind to Calia Menethil could potentially lead to the unification of the Horde and Alliance as one faction under a new undead god queen empress. Monarchy can be an important storytelling device in fantasy and could potentially serve as an interesting plot point.
It is worth noting that as much as this is a fan fiction idea, the lore and official story of the game do not contain this particular plot.