public AnimeComparisonEntry Build() => new AnimeComparisonEntry
 {
     Seiyuu          = _seiyuuBuilder?.Build() ?? _seiyuu,
     AnimeCharacters = _animeComparisonSubEntries
 };
 public SeiyuuComparisonSubEntry Build()
 => new SeiyuuComparisonSubEntry
 (
     _characterBuilder?.Build() ?? _character,
     _seiyuuBuilder?.Build() ?? _seiyuu
 );
 public SeasonSummaryEntry Build()
 => new SeasonSummaryEntry(
     _seiyuuBuilder?.Build() ?? _seiyuu,
     _animeBuilder?.Build() ?? _anime,
     _characterBuilder?.Build() ?? _character
     );