Historical Record
Historical records concerning Xu Gai are exceedingly scarce; in the surviving biographical materials, there is almost no passage directly mentioning his life and deeds. According to the available information, Xu Gai is mentioned in only one scroll of the histories. This indicates that his standing in history, or the role he played, may not have been notable, or that his deeds were not recorded in detail. Within the scope of the official histories, we can find no description of Xu Gai's birth, death, official posts, accomplishments, or any specific actions. His existence is shown more through his connection with other figures, especially in the record of his son Xu Ba, where Xu Gai's identity as the father is confirmed. Such a record existing solely on the basis of kinship makes Xu Gai appear especially vague in the long river of history, lacking independent biographical content. Therefore, in strict historical verification, the image of Xu Gai is blank, and his life and deeds cannot obtain any solid detail from the official histories. This forms a sharp contrast with the many figures who left a bold and vivid mark on the historical stage, and likewise makes later understanding of Xu Gai rely almost entirely on indirect clues and inference. Nevertheless, his identity as the father of Xu Ba at least proves a definite position for him in the family lineage.
In the Novel
In contrast to the dearth of biographical material, in novels such as Romance of the Three Kingdoms Xu Gai likewise received no independent literary portrayal. This means that, whether in the official histories or in the popular novel, Xu Gai was granted no specific plot, character traits, or any notable action. In the vast narrative of the novel, countless historical figures were granted vivid life and dramatic conflict, yet Xu Gai remained always in a state of "invisibility." This indicates that even in the free space of literary creation, the author never chose to make any invention or supplement regarding Xu Gai. Therefore, in the novel, the image of Xu Gai is, like the historical record, almost blank. He took part in no battle, delivered no speech, and had no interaction with any other major character. This condition of being "unrecorded in the histories" and "absent from the novel" makes Xu Gai a figure lacking a concrete image in both the historical and literary dimensions. His presence is limited to the basic fact of his being a relative of Xu Ba, without any added literary color or dramatic element. This forms a sharp contrast with the many historical figures "processed" or "fleshed out" in the novel, further highlighting Xu Gai's marginal position in the narrative.
Key Relationships
Xu Gai's key relationship is limited solely to his father-son relationship with Xu Ba. In the existing biographical materials, Xu Gai is mentioned as the father of Xu Ba, and this is the only confirmable kinship connection. This relationship is the sole basis for Xu Gai's existence in the historical record, and the core by which his identity can be determined. Apart from this father-son relationship, no other figure is clearly recorded as having any direct or indirect connection with Xu Gai—whether kin, friend, colleague, or opponent. In the novel, this relationship is likewise not further developed or granted more plot; the interaction or emotional bond between Xu Gai and Xu Ba is at the literary level equally absent. Therefore, Xu Gai's social network and human relations appear extremely simple and singular in both history and the novel, limited solely to the blood tie of being the father of Xu Ba. This singular relationship makes the image of Xu Gai all the flatter, lacking the multidimensional social connections to support his presence in history or literature.
Signature Scenes
Because neither the biographical nor the novelistic materials record any specific deed or action of Xu Gai, no "signature scene" related to Xu Gai can be determined. Xu Gai took part in no important historical event, nor played a role in any literary plot. His existence is limited to his identity as the father of Xu Ba being mentioned, and this mention itself did not occur within any specific scene or event, but is more like an annotation in a family lineage. Therefore, neither valiant performance on the battlefield, nor political struggle at court, nor tender moments of daily life can be associated with Xu Gai. His life is blank, with no particular scene that could be depicted or reconstructed. This makes Xu Gai lack, in both the historical and literary realms of imagination, any image that could be made concrete. He is a pure "name," not a figure with concrete experiences and scenes. This condition of lacking signature scenes further confirms Xu Gai's marginality and vagueness in the historical narrative.
Relationships
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Family1
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