A group of fairy siblings. They are very mischievous but also very kind - hearted. They can offer their unique fairy magic to assist Jane and the dragon. For example, they can create illusions to deceive their enemies or use their small size to get into places that are otherwise inaccessible.
Hermione would be a great addition. She could use her vast knowledge of magic and research skills to help Harry and Buckbeak in their adventures. For example, if they were on a quest to find a rare magical herb to cure Buckbeak of a strange illness, Hermione would know exactly where to look.
One potential character could be a new time - traveling warrior from a different dimension. This character could bring in unique fighting styles and powers that the Dragon Ball characters have never seen before.
Grover Underwood could be included. His knowledge of nature and his ability to sense danger could be very useful. He could provide some comical relief in the midst of the serious prophecy - related events. And his loyalty to Percy would ensure that he is always there to support him, even when dealing with the often - prickly Artemis.
Well, Annabeth could be added. She would be really important as she is Percy's love interest. Her intelligence and strategic mind could play a big role in dealing with Gaea. Maybe she tries to find a way to break Gaea's hold on Percy if Gaea has some sort of power over him. Another character could be Nico di Angelo. His powers over the dead might be useful in uncovering secrets about Gaea's past and weaknesses. He could also be a voice of reason for Percy when Percy is in a difficult situation with Gaea.
A witch character would be great. She could either be a helpful mentor to Gregory, teaching him magic spells, or a mischievous troublemaker who constantly plays pranks on him.
A wise old little monster could be added. This character could act as a mentor to Maurice, guiding him with ancient knowledge and wisdom. For example, when Maurice is faced with a difficult decision, the old monster can offer insights based on the history of the little monsters.
The Weasley twins, Fred and George, could be great characters to add. Their mischievous nature and love for pranks could either annoy Cornello or get him to loosen up and see the fun side of magic. They could also use their inventive magical skills to help Harry and Cornello in some tricky situations. Additionally, Luna Lovegood could be added. Her unique perspective on magic and the wizarding world might make Cornello question his own beliefs and she could also form an interesting friendship with Harry within the context of this fanfiction.
Adding a character like Amanda Waller would be interesting. She could be pulling the strings behind some of Peacemaker's missions, adding a layer of mystery and political intrigue. Or even bringing in a character like Green Arrow for a brief encounter to see how their different ideologies clash.
A young dragon - trainer. This person could have unique knowledge about dragons that even the Red Dragon doesn't know. They could help the Red Dragon unlock new powers or skills.
A young dragon slayer from a far - off land who has a unique magic related to the elements that haven't been seen in Fairy Tail before. Maybe his magic is connected to some aspect of the Dragon Cry.