With a child theme you can add additional custom tags/search taxonomies for your comics, some people utilize this for adding ‘artist’ tags, but they can be modified for anything really.

// first you want to call an init to the function so it registers right away

add_action('init', 'mycomic_initialize_extra_taxonomy');

// then we want to add the taxonomy information call\
// change the 'comiceasel' to your themes slug for translation if you need
// change 'characters' to 'artists' here, or to whatever taxonomy name you want, note the info to the left of
// the => to see what it's asking for in information

function mycomic_initialize_extra_taxonomy() {
		$labels = array(
				'name' => __('Characters', 'comiceasel' ),
				'singular_name' => __( 'Character', 'comiceasel' ),
				'search_items' =>  __( 'Search Characters', 'comiceasel' ),
				'popular_items' => __( 'Popular Characters', 'comiceasel' ),
				'all_items' => __( 'All Characters', 'comiceasel' ),
				'parent_item' => __( 'Parent Character', 'comiceasel' ),
				'parent_item_colon' => __( 'Parent Character:', 'comiceasel' ),
				'edit_item' => __( 'Edit Character', 'comiceasel' ), 
				'update_item' => __( 'Update Character', 'comiceasel' ),
				'add_new_item' => __( 'Add New Character', 'comiceasel' ),
				'new_item_name' => __( 'New Character Name', 'comiceasel' ),
				); 	

		register_taxonomy('characters', 'comic', array(
					'hierarchical' => false,
					'public' => true,
					'labels' => $labels,
					'show_ui' => true,
					'query_var' => true,
					'show_tagcloud' => false,
					'rewrite' => array( 'slug' => 'character', 'with_front' => true, 'feeds' => false ),
					));

// Now we register the taxonomy we created with the comic post type
// change comic to 'post' here if you want it associated with regular posts instead

                 register_taxonomy_for_object_type('characters', 'comic');
}

Now that you have the taxonomy created, you need to display it
again, change characters to the taxonomy name you used in the code above
then add the mycomic_display_comic_whatevername?() to wherever in your single.php or content.php you want it to display
remove the if ($post->post_type == ‘comic’) { } if statement if you’re using the ‘post’ post type (or change it to ‘post’)

function mycomic_display_comic_characters() {
	global $post;
	if ($post->post_type == 'comic') {
		$before = '<div class="comic-characters">'.__('Characters','comiceasel').': ';
		$sep = ', '; 
		$after = '</div>';
		echo get_the_term_list( $post->ID, 'characters', $before, $sep, $after );
	}
}