I actually like Beryl alot. Also I think it is silly that people think that her sympathetic backstory as being a human woman who fell in love with Endymion didn't apply to her in that canon. She very much did so and it was shown she desired for Endymion to be her husband as well as her anger towards the Moon Kingdom taking her away from him. Likewise there is no evidence that the Shitennou were also not Endymion's guardians. It is implied they were and outright stated in some 90s anime supplementary materials and more authoritative ones not the weird audio dramas and in the 90s anime the Dark Kingdom were people from the Earth who rebelled against the Golden Kingdom and the Silver Millennium. They were not foreigners from neither or invaders from another dimension like in the DiC dub of the series and in fact it was Queen Metalia's emerging from the Sun which allowed for the rise of the Dark Kingdom on Earth with Beryl as the Queen and in many ways the sort of Priestess of Queen Metalia.
Whether Beryl was evil originally would depend on your opinion. I don't believe that Beryl was necessarily evil originally but I do believe that she loved Endymion and she resented Princess Serenity for how she thought that the Princess took Endymion for her. I imagine that Metalia probably twisted the Witch's Desire for Endymion and her hatred for the Princess into the evil Queen that she became.
Whether Beryl was evil originally would depend on your opinion. I don't believe that Beryl was necessarily evil originally but I do believe that she loved Endymion and she resented Princess Serenity for how she thought that the Princess took Endymion for her. I imagine that Metalia probably twisted the Witch's Desire for Endymion and her hatred for the Princess into the evil Queen that she became.