This kind of manga usually contains inappropriate and uncomfortable content. It might involve excessive sexual or vulgar elements that are not suitable for the general audience.
The funny part about Korra's hair in the comic could be due to its unexpected length, or perhaps it has some crazy curls or a strange combination of colors that catches your eye and makes you laugh.
Hentai muscular manga often features exaggerated physical builds of characters with a focus on musculature and sometimes includes adult or explicit content.
I don't think there's a clear relationship. 'Kiss cartoon' might refer to some sort of cartoon platform or genre, while 'castle in the sky' is a specific animated film. But it's hard to say if they have any specific link.
The Bronze Age Iron Man comics were characterized by increased technological advancements for Iron Man's suits. Story arcs were longer and more interwoven, and there was a stronger emphasis on the impact of his actions on the world around him.
The stencils manger scene could be significant as it might play a role in character development, plot advancement, or as a visual element that adds depth and meaning. But we'd need more context to understand exactly how and why.