The dynamics of Fairy Tail would change in multiple ways if Acnologia joined. Firstly, in terms of leadership, Makarov would have to deal with a very powerful and potentially unruly member. There would be new power hierarchies to consider. Emotionally, the guild would be in turmoil. Some members would be excited about the new possibilities his power brings, while others would be terrified. The guild's activities would also change. Instead of just taking on normal jobs, they might be involved in more high - stakes battles because of Acnologia's presence. And his knowledge of dragons and ancient magic could open up new storylines and adventures for the whole guild.
If Acnologia joined Fairy Tail, the dynamics would be completely different. He's a dragon, and his very nature is different from the mostly human members. His joining would likely cause a divide between those who welcome the added power and those who are worried about the danger he poses. The guildhall might need to be adjusted to accommodate his needs. Socially, he would be an outcast at first, but as time goes on, his relationships could develop. For example, he might form an unlikely friendship with Happy or Carla, which would be very interesting to explore in the fanfic.
The power balance would shift significantly. Acnologia is extremely powerful, so the guild would become a much more formidable force. There would be a lot of unease among the members at first, especially those who have heard of his past deeds. But his presence could also inspire some members to train harder to reach his level. The guild's reputation would also change, as having Acnologia in Fairy Tail would attract both fear and respect from other guilds.
The characters in Fairy Tail would have a wide range of reactions. Makarov, as the guild master, would be very cautious. He would need to ensure that Acnologia's presence doesn't put the guild in more danger. Happy would be constantly on guard around Acnologia, ready to fly away at the first sign of trouble. The Thunder Legion would likely be in a state of high alert. However, some of the more adventurous members like Cana might see it as an opportunity for great adventures and powerful new magic. It would be a complex situation with different characters having different stances based on their personalities and past experiences.
The Wood Style would introduce a whole new element of combat. In Fairy Tail, most of the magic is elemental - based like fire, water, etc. or celestial - based. Wood Style could provide a more strategic and defensive approach. For example, a character using Wood Style could quickly create barriers or traps made of wood during battles. This would force the opponents in Fairy Tail to adapt their fighting styles.
Their marriage could also lead to more diplomatic relations within the guild. Levy is friendly with most members, and Gajeel has his own group of comrades. Their union could bridge any gaps between different cliques in the guild. For instance, if there were disputes between the more bookish members and the combat - focused ones, Gajeel and Levy could step in and mediate, using their combined influence.
The guild as a whole would likely mobilize. Erza would start formulating a strategic plan. She'd consider the strengths and weaknesses of Acnologia and figure out the best way to approach the situation. Gray would also be ready to fight, using his ice - make magic to support the rescue mission. They would all be united in their determination to get Lucy back safely.
Saiyan characters often bring a new level of physical power. In Fairy Tail, most characters rely on magic, but a Saiyan's brute strength and ability to transform can shift the balance of power in battles. For example, a Saiyan going Super Saiyan could be a game - changer against a powerful dark wizard.
In a fanfiction, the Planettary Anchor could be a catalyst for character growth. For the younger members of Fairy Tail, it could be a test of their courage and magical abilities. They might be forced to step up and learn new skills in order to deal with the situations that the anchor creates. At the same time, the more experienced members would have to reevaluate their strategies and leadership as the anchor brings in new and unexpected challenges. This would lead to a shift in the overall dynamics of the guild as everyone adapts to the changes brought about by the Planettary Anchor.
Some writers characterize Acnologia as a misunderstood loner. They show that his actions of destruction are a result of his past traumas. Others might make him more of a power - hungry villain who just wants to rule over all. There are also those who give him a sense of humor, which is a very different take from his usual brooding and menacing self in the original series.
Some members might be initially cautious. Given her past as a powerful and somewhat feared being, they would be worried about her true intentions. For example, Gray might be on guard until he sees her actions are genuine.
Their meeting could be very intense. Acnologia with his menacing presence and Anna with her calm yet strong demeanor. It might be a situation where Anna stands her ground against Acnologia, not showing any fear, which could either enrage or intrigue him.
Well, adapting to Acnologia's body could be a complex process. They would have to learn how to control the raw power within it. This power might be overwhelming at first, and they could accidentally cause destruction. To adapt, they might start by testing their limits in isolated areas. Emotionally, they would also have to come to terms with the fact that they are now in the body of a feared being. They might try to use their memories of Fairy Tail to bring out the good in this new form, like using Acnologia's strength to protect the weak as they did in their previous life.