Marina herself is likely to be one of the most memorable characters as she is in the title. She might have unique traits such as being extremely brave or having a great sense of humor that makes her stand out.
Another idea is that there is a mystery involving the eight characters, and Marina is the key to solving it. She might start to notice strange patterns in their behavior or the environment around them that lead to a big revelation. For example, they could be part of an ancient prophecy that only Marina can understand and fulfill.
Definitely Yuno Gasai from 'Future Diary'. Her extreme love and possessiveness towards Yukiteru make her stand out. She is willing to kill anyone who gets in the way of her relationship with him. Her cute appearance combined with her terrifying actions create a very memorable character.
In the 'Best of Husbands' novel, if there is a character who has a very difficult decision to make and the way they handle it is both unexpected and in line with their developed character, that character could be very memorable. For instance, a character might have to choose between loyalty to a friend and following their own moral code. The way they navigate this dilemma and the consequences that follow can etch them into the reader's memory.
There's also a Pokemon character, a shiny Zoroark. It's a misfit because it's constantly hunted by poachers due to its shiny appearance. It has to constantly hide and be on the run. In the fanfic, it teams up with a group of misfit trainers who help it protect itself and in turn, it uses its illusions to help them in battles.
A female character who defies the norms of the society depicted in the fanfic can be very memorable. She could be a warrior or a political strategist in a world where women are mostly confined to domestic roles. Her struggle for equality and recognition within the male - dominated society is an engaging aspect of the story.
Another memorable character could be a new character created specifically for the fanfic. Maybe a mysterious ninja who has a complex backstory and strange powers. Their interactions with Naruto and the other established characters would make them stand out.
The caretaker of the mansion is often a memorable character. They usually have a dark past and seem to know more about the secrets of the mansion than they let on.
One memorable aspect is her visual style. Marina often had very distinct looks that matched the themes of her albums. For example, during the 'Electra Heart' era, she had a very specific pastel - colored, 50s - inspired look that became iconic. Another is her vocal range. She can hit some really high notes and also has a very emotive lower register, which adds a lot to her storytelling in songs.
Violet from 'Murder House' is memorable. She's a troubled teen who has to deal with not only the typical teenage angst but also the fact that she's living in a haunted house. Her relationship with Tate and her discovery of the house's secrets are some of the most engaging parts of the 'Murder House' storyline.
The witch, for sure. Her powerful presence and the dark magic she wields made her really stand out.