What could be a story for Chibiusa's seventh birthday fanfic?

Add some mystery. For example, hide a secret message in the story that Chibiusa has to figure out during her birthday. It could be a riddle left by a mysterious character.

Well, in a Borderlands Claptrap birthday fanfic, it might start with Claptrap waking up and not realizing it's his birthday. As the day progresses, he has his usual misadventures, but then starts noticing little things that seem off. Eventually, his friends from Sanctuary show up with a huge cake made out of some strange Borderlands -esque ingredients and they all celebrate. It could be filled with his trademark humor and the chaos that usually surrounds him.

There is a fanfic titled 'The Bond of Chibiusa and Her Sister'. In this, it delves deep into how they support each other through different challenges in their magical world. It's a really engaging read as it also shows their growth as characters.

A common theme is sisterly love. The stories often revolve around the deep bond between Chibiusa and her older sister.

It could be about a grand celebration in the Phantomhive manor. All the servants could be running around trying to make everything perfect for Ciel's birthday. Sebastian might be cooking up a storm in the kitchen, preparing all of Ciel's favorite dishes. There could also be a surprise visit from some of Ciel's business associates or friends from the nobility. And perhaps, in the midst of all the celebration, Ciel has a moment of reflection on how far he has come and the challenges he still faces.

A Claptrap birthday fanfic could involve Claptrap getting a software upgrade as a birthday present. This upgrade could give him new abilities, like being able to sing happy birthday in multiple languages at once. And all the other characters would gather around, some reluctantly like Handsome Jack, but still there to celebrate. There could also be a big cake made out of some sort of Pandora - like substance, like eridium - flavored frosting.

Well, 'Journey of Hearts' is also a great one. It begins with a chance encounter between Gohan and Chibiusa. The story then delves into how they gradually open up to each other, sharing their hopes, fears, and dreams. It's a really heartwarming fanfic that shows their relationship developing in a very natural way.

It's a story about a transformed version of Chibiusa with a darker theme and adventure.

Well, the plot could be about Percy feeling really sad and left out when everyone forgets his birthday. Maybe he starts to question his friendships. He could go off on his own for a while, and then his friends realize their mistake and try to make it up to him with a big, surprise celebration.

Well, it could be that Percy's forgotten birthday is the final straw in his relationship with his family. He could decide to focus solely on his work at the Ministry, becoming even more of a workaholic. This would add to his already existing sense of alienation. Maybe he would meet someone at work who takes pity on him and tries to cheer him up, leading to an unexpected friendship.