In many Disney cartoons, the siblings have shared goals and face challenges together. Their relationships add depth and warmth to the stories. Sometimes they have conflicts but eventually resolve them and grow closer.
I have no clue. 'Hentai manga two heads' is quite an obscure and perhaps unconventional concept. It's hard to determine a theme without seeing the actual manga or having more context.
I have no clue. They might be characters or concepts from different art forms that have been brought together in an unconventional way, but without additional information, it's impossible to determine exactly how they relate.
The use of exaggerated expressions and unexpected elements can create pleasant surprise faces in caricatures. It's all about going beyond the ordinary.
Echii mangas usually have more adult-oriented content like sexual themes and imagery compared to regular mangas which may focus on a wider range of genres and themes.