Obviously, Harry Potter is one of the main characters. He's the father of the triplets. Hermione and Ron would probably also be important characters, as they are Harry's closest friends and would likely be involved in the triplets' lives, perhaps as godparents or just as trusted advisors.
Dumbledore, even if only in spirit or through memories, could also be a significant character. His wisdom and influence on Harry would likely shape how Harry raises his triplets. And of course, there could be new characters introduced, like the triplets' schoolmates or teachers at Hogwarts who play important roles in their growth and development.
The triplets themselves are usually the main characters. They could be given names like James, Lily, and Sirius as a nod to the original series' characters. Often, they'll have traits that set them apart, like one being extremely intelligent, another very brave, and the third having a heart of gold.
Obviously, Bella is one of the main characters. Since it's about her having triplets, she'll be central to the story, dealing with all the new challenges.
Maybe Ron Weasley. Imagine a fanfiction where Ron, after getting married, has triplets. Given his humorous and sometimes clumsy nature, it would be really fun to see how he and his wife deal with three little ones. He could pass on his love for food and his loyalty to his children in a really endearing way.
Obviously, Harry Potter would be one of the main characters since it's in the title. There might also be his friends like Ron and Hermione. They could be involved in helping Harry understand and control his newfound claw - related abilities.
Obviously, Harry Potter is one of the main characters as the title implies. He would be leading the army. His friends like Ron and Hermione would most likely be involved too, providing support and their own unique skills.
Well, one interesting plot could be how Harry manages to balance his new role as a father of triplets while still dealing with the wizarding world's threats. Maybe the triplets inherit some unique magical abilities that draw both good and bad attention.
There could also be new characters introduced in the fanfiction. Maybe an old wizard or witch who has knowledge about the plague bloodline and its secrets. This character could act as a mentor to Harry, guiding him through the discovery of his heritage and the powers that come with it.
Well, obviously Harry Potter and his twin are the main characters. Harry is known for his courage and his connection to Voldemort. His twin, depending on how the fanfic is written, could be someone with a different set of traits, like being more studious or more outgoing. Then there would also be characters like Ron and Hermione who are likely to be involved in the story. They are Harry's best friends in the original series and would surely have a role to play in the fanfic as well, whether it's helping the twins with their adventures or dealing with the complications that the twin's presence brings.
They could be the children of Luke Skywalker. Maybe he had triplets in secret, and they inherit his strong connection to the Force. Each of them could have different personalities, like one being very brave and impulsive, one being more cautious and intellectual, and the other being empathetic and diplomatic.
Since I don't know the exact 'triplets secret novel', I can't say for sure. But likely the triplets themselves are main characters.