This god means that in myths and legends or fantasy novel, people with deep connections have to call themselves when facing mortals.
The deity is a unique concept of tantric Buddhism. There are four sects in Tantric Buddhism, and each sect has its own spiritual universe model, namely "Tancheng" system. This system consists of a secret god and some family gods. The main god of Tancheng is what people call the deity. Every meditator should take his own god as the object of meditation.
The famous good gods are Manjusri Bodhisattva, Avalokitesvara Bodhisattva, Tara and Infinite Life Buddha. And the famous angry-faced gods are Vader King Kong, Matou King Kong and King Kong Pani. The gods where good and evil coexist are Mi King Kong, Victory King Kong, Hewajira, Time Wheel King Kong and King Kong Hai Mu.
About the usage of god. This god was originally its own name. Generally, people with higher status will call themselves deities, just like ancient emperors call themselves me, and they are lonely and widowed. In fact, God can also address others to show respect and admiration for others.