This character is Deceased.
Queen Beryl was the leading force behind the downfall of the Silver Millennium/Moon Kingdom, serving the force called Metalia. When the senshi were reborn in modern Japan, she was once again their enemy, using the Shitennou to fight the senshi and claiming the name Dark Kingdom for the group.
Before becoming the evil queen we know, Beryl was a citizen of Earth who fell in love with Prince Endymion, and seeing him fall in love with the Moon Princess instead brought her into Metalia's power.
Further information about her is here.