The hero or heroine is usually very memorable. They often drive the story forward with their actions and decisions.
There might be some side characters with unique personalities. For instance, a jolly innkeeper who provides comic relief and also some important information to the main characters at crucial times. Their presence adds color and depth to the story.
The villain can also be extremely memorable. Their evil deeds and the challenges they pose to the main characters make them stand out. In some novels, a wise old mentor figure is very memorable too. They guide the protagonist with their wisdom and experience.
Milady de Winter is also quite unforgettable. She is a complex and devious character. Her beauty hides her cruel and manipulative nature, and she causes a great deal of trouble for the heroes in the story.
Holden Caulfield from J. D. Salinger's 'The Catcher in the Rye' is very memorable. He is a disillusioned teenager, cynical about the adult world. His narrative voice is unique and his journey of self - discovery and rebellion is something that many readers can relate to.
In 'Dune', Paul Atreides is very memorable. He goes through a great transformation from a young noble to a powerful warrior - messiah. In 'The Iliad', Achilles is the most prominent and memorable. His wrath and his incredible fighting abilities are central to the story. In 'Redwall', Matthias is a memorable character. He grows from a young mouse into a brave warrior, leading his friends in the defense of Redwall Abbey.
Dulcinea del Toboso is memorable as well, even though she is more of an idealized figure in Don Quixote's mind. She represents the unattainable object of his chivalrous love and plays an important role in driving his adventures.
Remy from 'Ratatouille' is super memorable. His story of being a rat in a kitchen, which is not a place rats are usually welcomed, is really unique. He has to hide his identity while showing off his amazing cooking talent. Another memorable one is Templeton from 'Charlotte's Web'. His greedy yet sometimes helpful nature makes him stand out. And then there's Nicodemus from 'The Secret of NIMH'. His leadership among the rats and the whole mystery around their enhanced intelligence is quite captivating.
Definitely Boba Fett from Star Wars. His origin as a clone gives him unique abilities and a complex backstory. He stands out as a bounty hunter. Then there's the clones in 'The Island'. Their situation of being trapped as organ donors makes them very memorable.
Jace is definitely one of the most memorable. His cocky attitude and his amazing fighting skills make him stand out. Then there's Clary. Her discovery of her Shadowhunter heritage and her journey to understand her powers are very interesting. Also, Simon is quite memorable. He's a normal human turned into a vampire, and his struggle to adapt to this new life is engaging.
Vito Corleone, even though his story is also in the past in this novel, his influence on the family and his rise to power are quite remarkable. His wisdom and leadership in building the Corleone empire stay with the reader.
The three musketeers stand out. Athos has a tragic past which adds depth to his character. Porthos is big - hearted and his pursuit of wealth in a rather comical way makes him memorable. Aramis with his dual life of a musketeer and his religious aspirations is quite interesting. And D'Artagnan, who comes from the provinces and has to navigate the complex world of Paris, is a central and unforgettable character.
The second Mrs. de Winter is very memorable. She is like an outsider trying to find her place in a world full of secrets. Her insecurities and her journey of self - discovery within the context of Manderley make her stand out.