A young dragon rider from a distant island who has a very different style of riding and communicating with dragons. This character could bring new techniques and ideas to Hiccup and his friends.
An old hermit who has been living alone in the mountains for years and has a deep knowledge of ancient dragon lore. He could help Hiccup unlock secrets about the dragons' past and their hidden powers.
A female warrior from a tribe that has been at odds with Hiccup's tribe. At first, she might be hostile, but as the story progresses, she could become an ally. She could have her own set of skills, like being an expert in hand - to - hand combat and having a special bond with a particular type of dragon that Hiccup has never encountered before.
A new demigod from a previously unheard - of god or goddess. Maybe a child of a minor deity who has some unique powers that could either help or hinder Percy in the situation of the collapse. For example, a child of Hypnos who can manipulate sleep and dreams, and their powers could be used to either give Percy visions of how to fix things or put him in a dangerous trance.
A potential new character could be a magical art teacher who has the ability to bring out the best in Evillustrator's powers. Another could be a street artist who becomes friends with Evillustrator and gets caught up in the superhero - villain drama. Maybe a young aspiring artist who looks up to Evillustrator and tries to help him turn good.
Maybe some of Sirius' old schoolmates that he hasn't seen in a long time could be introduced. They could come to visit Sirius and Harry and bring with them new stories and magic. Another potential character could be a mysterious neighbor who is also a wizard but has been in hiding. This neighbor could either be a friend or a foe, adding an element of mystery to the story.
A young and talented artist could be a new character. The empress could commission the artist to create a portrait or some art for the palace, and in the process, a unique friendship or a complex relationship could develop. The artist could also be a source of inspiration for the empress in different ways.
One potential new character could be an old hermit - like wizard who has been living in the woods near the manor. He has a deep connection with the land on which the manor stands and can communicate with the spirits of the forest. He could be a source of ancient wisdom for the main characters. Also, a young and adventurous witch who is on a quest to find a lost magical gem that is rumored to be hidden somewhere in the manor. She could bring a new dynamic to the group with her fearless and independent nature. There could also be a magical gardener who takes care of the manor's enchanted gardens and has some secrets of his own.
A healer from a remote planet who has special knowledge about pregnancies in Force - sensitive beings could be introduced. This character could help Padme during her difficult pregnancy. Another could be a smuggler who is hired to transport Padme to a safe location for the birth of her child. Also, a young Jedi apprentice who discovers Padme's pregnancy and has to make a choice about whether to inform the Council or not.
A skilled samurai girl from the Iron Country. She could be a master of a unique sword - fighting style. Maybe she initially distrusts Naruto because of the differences between ninja and samurai, but later becomes his ally and friend.
A mysterious detective from another city who has a different approach to solving crimes compared to Sherlock. This character could initially be at odds with Molly but later become an ally. Another could be a reclusive scientist who has some dark secrets related to the cases Molly is involved in. There might also be a street - smart informant who has connections in the underworld and provides Molly with valuable information, but at a price.
A group of rogue demigods who have been using vapor travel to steal from other realms. They could be both enemies and potential allies depending on the situation. They might have unique powers related to vapor manipulation that Percy and his friends have never seen before.
A new tech - savvy villain who is a master of hacking could be introduced. This villain could pose a threat to both Batmen as they rely on technology in different ways.