getMangaCharacters method
Implementation
Future<BuiltList<CharacterRole>> getMangaCharacters(int mangaId) async {
var url = '/manga/$mangaId/characters';
var response = await _getResponse(url);
final characters = response['characters'] ?? [];
return serializers.deserialize(characters,
specifiedType: _fullType(CharacterRole))! as BuiltList<CharacterRole>;
}