I don't know for sure as I haven't read it. But it could be Harry Potter, Hermione, and Ron, as they are central to most Harry Potter - related stories.
Since it's a fanfiction, it could feature not only the well - known characters from the original series like Harry, but also some original characters created by the fanfiction writer. Maybe there's a new student who is the focus of the 'welcome' and they interact with Harry and his friends. It could also have characters from different Hogwarts houses coming together for this welcome event.
I'm not sure specifically as there could be many different interpretations. It might be about a warm welcome given to a character in a Harry Potter - inspired fanfiction story, perhaps when a new student arrives at Hogwarts or a hero returns to the wizarding world.
It could be about Harry Potter facing some sort of dark situation. Maybe he's in a place full of dark magic or has to deal with dark forces that he has to welcome in a sense, perhaps as a part of a greater battle or self - discovery.
Well, clearly Vionery is one of the main characters. Depending on the story, Harry Potter himself might also be a central figure, as he often is in most Hogwarts - related fanfictions. Hermione Granger could also be involved, using her intelligence to assist Vionery in her adventures or studies at Hogwarts.
In harry potter the marauders fanfiction, the main characters are the Marauders themselves. James Potter, the confident and sometimes arrogant Gryffindor. Sirius Black, the black sheep of his pure - blood family. Remus Lupin, the kind - hearted werewolf. And Peter Pettigrew, who was initially part of their tight - knit group. Their interactions, friendships, and later the events that lead to their fates are central to these fanfictions. They are often depicted in their Hogwarts days, full of youth, adventure, and magic.
Harry Potter is the mainstay, as the story is based in the Harry Potter universe. Kurama is the new element that makes it a crossover. In addition, characters like Snape could play significant roles. Snape's complex nature might lead to interesting interactions with Kurama. He could be initially hostile but then come to realize Kurama's value in the fight against the dark side. And of course, Hagrid, with his love for magical creatures, might befriend Kurama and help him adjust to the wizarding world.
Hermione Granger might also be a main character. She is an important part of the original series and her intelligence and knowledge would be useful in uncovering any truths in this fanfiction. Also, Ron Weasley could be there as Harry's loyal friend, and together they could face the challenges related to the 'truth' in the story.
Most likely Harry Potter himself would be one of the main characters. After all, it's in the title related to the Harry Potter world. And of course, the ogre would be a main character too as it's a key part of the fanfiction.
Harry Potter and his friends might also be main characters. Since it's a Harry Potter fanfiction, they could be involved in the story trying to figure out the mystery of the pretender. Hermione would probably be using her intelligence to analyze the situation, while Ron would be there for support and some comic relief.
Hermione Granger could also be a main character. Given her intelligence and knowledge of potions, she would be a key figure in understanding and dealing with Smylex in fanfiction.
Obviously, Harry Potter is one of the main characters. And the snake, which could be a unique creation within the fanfiction, is also a main character. It might have its own personality and abilities that are different from normal snakes in the Harry Potter universe.