This might be because you give the characters unique personalities, backgrounds, and emotions through the description and shaping of the characters in the process of writing, making them more real and three-dimensional. When you create these characters, you might be able to imagine what they look like in the real world, and this feeling might make you more engaged and excited in the process of writing. It could also be because you described and shaped the characters in the process of writing to make them more vivid and interesting, so that you could better immerse yourself in the world of the novel. When you imagine these characters, you might imagine what they look like in the real world, and this feeling might make you like the characters in your novels even more. In short, you might like the characters in your own novels because you gave them unique personalities, backgrounds, and emotions in the process of writing, making them more realistic and three-dimensional. Or you might think that these characters are very interesting and allow you to better immerse yourself in the world of the novel.