Amazing Detective Di Renjie

! style="width:14.2%;" | Amazing Detective Di Renjie 2

! style="width:14.2%;" | Amazing Detective Di Renjie 3

! style="width:14.2%;" | Mad Detective Di Renjie

| colspan="4" | Liang Guanhua

| The Chancellor in the central court

| colspan="4" | Zhang Zijian

| Di Renjie's bodyguard

| colspan="4" | Lü Zhong

| The Empress of China

| colspan="4" | Xu Qian

| Di Renjie's student

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| Jiang Xinyan

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| Qu Shanshan

| Di Renjie's niece, originally an assassin

| only mentioned

| Yan Yansheng

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| Yan Yansheng

| Senior General of Right Mighty Guard Army

| colspan="2" | Xu Xiaobei

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| Li Junqi

| Founding Khan of the Tujue

| colspan="3" | Zhao Zhigang

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| Di Renjie's leading butler

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| colspan="3" | Liang Kai

| Di Renjie's assistant

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| Jia Yanfeng

| Liu Niqiu

| Li Zhuolin

| Di Renjie's assistant

| colspan="2" |Fu Hongjun

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| Prince of Liang

| colspan="2" |Wang Xinsheng

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| only mentioned

| Crowned Prince, historically Emperor Zhongzong of Tang

| Ren Xuehai

| Shao Yongcheng

| Ren Xuehai

| Wang Pu

| Chancellor in the central court

| Liu Shuang

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| Wu Zetian's daughter

| Yan Yansheng

| only mentioned

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| Mayor of Youzhou

| Kong Qingzi

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| Deputy mayor of Youzhou

| Peng Dan

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| Emperor Taizong's great-granddaughter

| Zhu Yanping

| Zhu Yanping (flashback)

| only mentioned

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| A general in the imperial guard

| Mei Zhigang

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| General in the rebel army

| Pan Yaochu

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| Resident of Big Willow Village

| Li Haifeng

| Li Haifeng (flashback)

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| Resident of Youzhou

| Li Shilong

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| A retired official living in Huzhou

| Xu Feilian

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| Liu Chali's son

| Jiang Xin

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| The Crown Prince's Maid of Honor

| Lu Ming

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| Son of Prince of Yue

| Zhao Junkai

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| Liu Chali's servant, a secret police

| Qian Yanqiu

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| A secret police

| Xia Zhiping

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| An official who bred horses for Wu Zetian

| Guo Xiao'an

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| A retired county governor, formerly a general under Yuwen Huaji during the Sui dynasty

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| Meng Lingfei

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| Di Renjie's assistant

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| Liu Jihe

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| Di Renjie's assistant

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| colspan="2" | Gong Haibin

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| Di Renjie's assistant

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| colspan="2" | Wang Lei

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| Di Renjie's assistant

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| colspan="2" | He Zhengheng

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| Di Renjie's assistant

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| colspan="2" | Li Zhuolin

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| Di Renjie's assistant

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| Qiao Hong

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| only mentioned

| Leader of a rebellion group while being the commander of Wu Zetian's secret police agency

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| Chunyu Shanshan

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| A highly skilled assassin

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| Jiang Changyi

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| A Khitan general serving in Wu Zetian's army

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| Huo Ercha

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| Senior General of the Left Guard Army

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| Song Chuyan

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| Commander of the Yingzhou Circuit

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| Cong Shan

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| Vice Commander of the Yingzhou Circuit

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| Chen Lei

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| A lower-ranked general under Wang Xiaojie's command

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| Zhou Ying

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| only mentioned

| A lower-ranked general under Wang Xiaojie's command

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| Zhang Chengxiang

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| Mayor of Chongzhou

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| Deng Wei

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| only mentioned

| Son of Jili Kehan

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| Shao Wanlin

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| A legendary astrologer and engineer

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| Shu Yan

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| Twin sisters and assassins

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| Li Shilong

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| Yuan Tiangang's student

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| Ji Jun

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| Owner of the Qingyang Hotel in Liuzhou

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| Su Gang

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| A leader in the rebel group while being a general in the imperial guard

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| Zhao Junkai

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| Originally a robber, then stole Xue Qingling's identity and became a Marquis

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| Long Muxue

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| Governor of Wuping County, but actually the real Xue Qingling

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| Bao Yucheng

| only mentioned

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| Mayor of Liuzhou then Jiangzhou, Di Renjie's student

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| Yang Si

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| The fake Xue Qingling's lover, but actually a secret police

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| Wang Peng

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| Lin Yongzhong's servant

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| Xue Zibin

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| Lin Yongzhong's daughter

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| Yang Ming

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| The leading servant in the Marquis Mansion

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| Fu Jun

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| Duke of Guiyi

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| Song Chuyan

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| Wang Kai's younger brother

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| Yang Zengyuan

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| Senior General in the Longwu Guard Army

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| Guan Yue

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| Wang Qiang's wife

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| Ran Yuan

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| A leader of a criminal group in Liangzhou

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| Zhao Liang

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| Senior General of Right Baotao Guard Army

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| Zhang Shuping

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| Governor of Shanyang County

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| Guo Qiming

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| Governor of Xuyi County

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| Zhao Junkai

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| Owner of a salt store

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| Yu Lianwei

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| He Wuqi's servant

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| Qiao Hong

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| He Wuqi's wife

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| Qu Shanshan

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| Widow of Li Han, an official in Ministry of Works

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| Wang Minggang

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| Vice Minister of the Works

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| Han Zhenhua

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| A landlord in Xuyi County

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| Dong Xuan

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| Ge Tianba's twin daughters

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| Yang Yan

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| Ge Tianba's subordinate

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| Zhang Hengli

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| Ge Tianba's subordinate

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| Qin Hanlei

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| Ge Tianba's servant

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| Zhong Weihua

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| A tailor in Yangzhou

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| Chai Jingjing

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| Sun Xiwang's wife

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| Qian Yanqiu

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| Prince of Ying, the gangmaster of the Iron Hands

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| Wang Pu

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| A top assassin in the Iron Hands

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| Gao Yuanfeng

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| A top assassin in the Iron Hands

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| Fan Chunlei

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| A top assassin in the Iron Hands

| only mentioned

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| Chen Weiguo

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| Di Renjie's student, future chancellor

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| Wang Xinsheng

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| Mayor of Yangzhou

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| An Ruiyun

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| Deputy mayor of Yangzhou

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| Yang Jun

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| A official in Yangzhou in charge of the maintenance of the Grand Canal

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| Chen Yilin

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| A slender man in Yangzhou

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| Wang Liao

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| A slender man in Yangzhou

| only mentioned

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| Su Hao

| Di Renjie's servant

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| Li Shilong

| Wu Zetian's cousin, Prince of Nanping

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| Yuan Ran

| Wu Youde's daughter, Princess Yingyang

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| Zheng Nan

| Wu Yuanmin's Maid of Honor

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| Fu Jun

| A Persian official who manages gold and silver instruments for Wu Zetian

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| Fu Jun

| Sharhan's triplet brothers

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| Liu Lei

| Sharhan's wife

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| Gao Peng

| Sharhan's servant

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| Gao Qiushan

| Sharhan's subordinate

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| Dai Yunxia

| Commander of Wu Zetian's secret police agency

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| Zhang Hongzhen

| King of the Yuezhi Kingdom

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| Li Xi'er

| Queen of the Yuezhi Kingdom

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| Zhang Guohua

| A prince in Yuezhi Kingdom

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| Liu Wendi

| A princess in Yuezhi Kingdom

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| Fu Jun

| Chancellor of Yuezhi Kingdom

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| Yan Lu

| An assassin based in Nie's Hotel

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| Wang Xinsheng

| A prince in Tujue

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| only mentioned

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| Qian Yanqiu

| A Turk general, Helu's follower

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| Chen Yilin

| The crowned prince in Tujue

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| Zhao Junkai

| An officer who manages military supplies in Hexi Corridor, Wu Youde's cousin

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| Yang Zengyuan

| A Turkic assassin, Helu's bodyguard

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| Yang Zengyuan

| Jiwangjue Khagan who surrendered to the Tang dynasty

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| Zhan Xiangchi

| The senior kentōshi from Japan

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| Suzuki Miki

| A kentōshi from Japan working in the Ministry of Wars

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| Zheng Cheng

| A kentōshi from Japan working in the Ministry of Wars

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| Wang Peng

| Chancellor of the Tujue Khanate

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| Wang Guoping

| Chancellor of the Tujue Khanate

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| Li Zhen

| A Turkic general following Ferghana

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| Li Jianyang

| A silversmith in Luoyang

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| A Xian

| A general from Tokhara Kingdom