Roland, the Gunslinger, is surely one of the most memorable. His stoic nature, his skills with his guns, and his unwavering dedication to reaching the Dark Tower make him stand out. Then there's Jake Chambers. His innocence and his bond with Roland are quite striking. Also, the Man in Black is very memorable, with his mysterious and somewhat menacing presence throughout the story.
Well, Roland is the central and most memorable character. His long and arduous journey to the Dark Tower, his code of honor, and his internal struggles are what make him so unforgettable. Eddie Dean is also quite memorable. He starts as a drug addict from our world but transforms into a brave and resourceful ally in Roland's quest. And Susannah Dean, with her strong will and the unique situation of being a combination of two personalities, is also a very memorable character in all dark tower novels.
The Gunslinger Roland is the most iconic character. He has a complex personality, being a man of honor yet also haunted by his past actions. Jake Chambers is also memorable. He is a young boy who gets caught up in Roland's journey and brings a sense of humanity and hope. And let's not forget Oy, the billy - bumbler. His loyalty and unique abilities add an interesting element to the story.