I disagree with this heavily Nehellenia in the 90's anime was horrifically dangerous and terrifying because unlike her manga counterpart she was very proactive the moment she was free from her mirror and the sheer RAGE and hatred she had for the people of the white moon.
According to the Quartets they had been placed in a deep sleep somewhere within the Amazon Jungle, awaiting the time when they could become the future protectors of Chibiusa, However, Queen Nehelenia woke them prematurely and forced them to work for her. After her defeat, they are returned to...
Wiseman is an eldritch abomination being that resides in the Black Gate, he was never human in the anime.
I think it was because SuperS was cancelled before they could add in the rest of the Outers for the season.