There are too many such examples, such as the doctor who lost his medicine bag in Jing Ke, the guide who showed Xiang Yu the wrong way by the Wujiang River, and the painter who painted Wang Zhaojun. More recently, for example, pointing out that Jin Wu is a "traitor" of Huang Tiandang, and making pearl jade white jade soup for Zhu Yuanzhang; More recently, such as saving Zeng Guofan who committed suicide by jumping into the river, and the executioner who assassinated Song.
The Battle of Guandu: Xu You and Chunyu Qiong
Battle of Red Cliffs: Jiang Gan, Kan Ze.
Guan Yu went to Maicheng: Mi Fang, Fu Shiren
Sun Jian was killed: Huang Zu.
I don't know the landlord's standards, but there are many others, such as Zhang Song, Fan Jiang, Zhang Da, Su Li, Hu Cheer, Xiahou Mao, Huang Hao, Xu Gong, Han Sui and so on. I hope it helps you.