Leslie William Stanton might be a minor character or have a specific storyline within the comics. But I'm not sure exactly without more context.
Merle does have a notable part. His actions and decisions affect the other characters and the plot development in significant ways.
Denise is an important supporting character in The Walking Dead comics. She provides medical expertise and support to the group.
Carl is a significant character in the comics. He grows and changes a lot over the course of the story.
Deanna is a significant character in the comics. She's a leader who tries to establish order and stability in a post-apocalyptic world.
Abraham is a significant character. He's tough and plays a key role in survival efforts.
Diane is a relatively minor character in The walking dead comics. She doesn't have a major impact on the main plot.
Axel is a supporting character who adds some drama and complexity to the story. He has his moments of importance and interaction with the main cast.
Donna is a supporting character who brings some additional depth to the story. She has her moments of importance but isn't a central figure.
Axel is a supporting character who brings some comic relief and adds complexity to the group dynamics.
Sebastian is a relatively minor character in The Walking dead comics. He doesn't have a major impact on the overall plot.