Jia Baoyu
In Zhiyanzhai's commentary, it is clear that Zhen Baoyu would have had a large part to play in the later parts of the novel, now lost. He is to send Jia Baoyu's jade back when it goes missing. Zhen Baoyu, like Jia Baoyu, also becomes a monk at the end. Hence, Zhen Baoyu can be said to be a mirror of Jia Baoyu, just as the fortunes of the fictitious Jia Clan are mirrored in those of the Zhen Clan (the "real" family).