Nina Wang is the second main character. Her personality is complex, i mean complicated. She always pretends to be strong and unfriendly at school yet she is very weak and loyal to her father, Sergay. Nina has more realtionship than just between father and daughter. They're not blood-related though... so it's okay if Nina loves her "Oto-sama"...(kinda sucks hearing her saying oto-sama with a very lovely voice....yucks...) Nina actually wants to be friends with Arika, and she IS friends with Arika and Ers, this great friend relation is shown when the three of them lying on the grass while Ers's leg is hurt. But Nina loses her patient and feeling just because Arika and Sergay, and she ends up killing Ers too. It's a pitiful story. Their friend relationship has to end here, I feel sad when watching it. Hiks, hiks...

And Nina's GEM actually never exists. The Ultimate Black Diamond is created because of Nina's anger, jealousy, and confuse when Ers dies. Her gem is corrupted by the Shinso's GEM, Mashiro naru Kongouseki (True White Diamond). I can't explain why, but maybe Nagi is making the connection?? Who knows? But this explains why the diamond is so strong, because it has the power of the Shinso's GEM. Nina is used by Nagi to play the Harmonium destroying Windbloom.