In many fanfictions about the Grand Magic Games, Lucy's Star Dress is often a key element. It can be depicted in different ways. Some fanfictions might show her using the Star Dress to gain an edge in battles during the Games. For example, she could combine different constellations' powers within the Star Dress to create unique and powerful attacks that surprise her opponents.
Lucy could be developed by showing her struggle to control the more powerful star dresses. For example, she might initially be overwhelmed by the strength of a new star dress but gradually learn to master it through training and self - discovery. This would show her growth as a mage.
One popular star dress fanfiction could be 'Lucy's Starry Adventures'. In this fic, Lucy uses her star dress in really creative ways to battle villains. Another could be 'Star Dress Magic Unleashed' where the author explores different powers of the star dress that Lucy uses. There might also be 'Lucy and the Star Dress Realm' which dives into the origin of the star dress and how Lucy came to master using it.
A fanfiction idea could be that Lucy's Celestial Spirit King Star Dress is coveted by a rival guild. They try to steal it from her during a grand magic tournament. Lucy, along with Natsu and the rest of Fairy Tail, has to protect the dress while also competing in the tournament. This leads to intense battles and strategic maneuvers, and in the end, Lucy realizes the true potential of the star dress not just as a power boost, but as a symbol of her connection to the celestial spirits.
One idea could be that Lucy discovers a new, extremely powerful star dress that has a mind of its own. It tries to take over her actions, leading to some chaotic and dangerous situations for her and the Fairy Tail guild. Another plot could involve Lucy's star dress being linked to an ancient prophecy. As she wears different star dresses, she uncovers parts of the prophecy that lead her on a quest to save the magical world.
A fanfiction plot could revolve around Lucy being cursed. The curse affects her ability to use the Celestial Spirit King Star Dress properly. She then has to go on a quest to find a cure, traveling to different magical lands and meeting new characters. Along the way, she discovers secrets about the star dress that were previously unknown, like it having a hidden power that can only be unlocked under certain conditions. As she searches for the cure, she also has to fend off those who would take advantage of her weakened state.
In some fanfictions, Lucy's Star Dress is shown as having a mind of its own during the Grand Magic Games. It might choose the best constellation form to use based on the situation at hand. For example, when she's in a team battle and needs to support her teammates, the Star Dress automatically switches to a constellation that has more defensive or healing capabilities. This gives an interesting dynamic to her character in the story.
In one fanfiction, Lucy uses her star dress to create illusions on a massive scale. She uses the star - like qualities of the dress to project images across the entire city. This is a very different use of the star dress as in the original series it's mainly used for combat and some basic magic. The fanfiction could explore how she controls these illusions and what she does with this newfound ability.
As I don't know the 'lucy star story', I can't determine who the main character is. But based on the name, it seems that Lucy might be the main character.