In many 'green skin' light novels, characters with green skin are often depicted as being more in tune with nature. For example, in some fantasy settings, they might have abilities related to plants or the earth. They can be seen as either primitive or having a deep, ancient wisdom depending on the story.
I'm not sure exactly how many are on the list you mentioned. There are quite a few, with Edgar Rice Burroughs writing many Tarzan novels over the years.
Some green - skin characters might have unique abilities related to their appearance. They could be more resistant to certain elements like poison if they are from a swamp - like environment which is often associated with the color green in fictional settings. In light novels set in magical worlds, they might have a connection to nature - based magic that normal human characters don't possess.
Tarzan is purely fictional. The character and the adventures associated with him were made up for entertainment. There's no historical basis or real events behind it.
Tarzan's story is purely fictional. It doesn't have any basis in reality. It's a creation that has captured people's imaginations over the years through books and movies.
Definitely not real. Tarzan is a fictional character. The story is a product of the author's imagination. It doesn't represent any actual historical or factual events or individuals.