This list will almost definitely not be complete, but it will hopefully provide some assistance in remembering the million and one characters.
Beware spoilers below.
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Feng Family (凤家)
The Matriarch – Feng Jin Yuan's mother
Feng Jin Yuan – Father
Feng Chen Yu – Eldest daughter and daughter of Chen shi
Feng Yu Heng – Second eldest daughter and daughter of Yao shi
Feng Xiang Rong – Third eldest daughter and daughter of An shi
Feng Fen Dai – Fourth eldest daughter and daughter of Han shi
Feng Zi Hao – Eldest son and son of Chen shi
Feng Zi Rui – Second son and son of Yao shi
Chen shi – First wife of Feng Jin Yuan
Yao shi (Yao Qian Rou) – Concubine and former first wife of Feng Jin Yuan
An shi – Concubine of Feng Jin Yuan
Han shi – Concubine of Feng Jin Yuan
Jin Zhen – Concubine of Feng Jin Yuan and former maidservant of Chen shi
Xuan Family (Imperial Family) (玄家)
Emperor – Da Shun's Emperor
Xuan Tian Qi (Prince Jing) – Eldest prince
Xuan Tian Ling (Prince Yuan) – Second prince
Xuan Tian Ye (Prince Xiang) – Third prince
Xuan Tian Yi – Fourth prince
Xuan Tian Yan (Prince Li) – Fifth prince
Xuan Tian Hua (Prince Chun) – Seventh prince, son of imperial concubine Zhao and adopted by imperial concubine Yun
Xuan Tian Ming (Prince Yu) – Ninth prince and son of imperial concubine Yun
Xuan Tian Ge – Daughter of princess Wen Xuan and is the Emperor's niece
Xuan Fei Yu – Son of Xuan Tian Ling (second prince)
Servants
Wang Chuan – Feng Yu Heng's servant gifted from the ninth prince
Huang Quan – Feng Yu Heng's servant gifted from the ninth prince
Qing Yu – Feng Yu Heng's purchased servant
Qing Lan – Feng Yu Heng's purchased servant
Qing Ling – Feng Yu Heng's purcahsed servant
Ban Zou – Feng Yu Heng's hidden guard gifted from the ninth prince
Qing Shuang – Servant brought in by Qing Yu
Bai Ze – Bodyguard for the ninth prince
Man Xi – One of Chen shi's first-rate maidservants
Bao Tang – One of Chen shi's first-rate maidservants
Yu Luo – One of Chen shi's first-rate maidservants