xia sini

A 5-6 year-old version of Chu Wanning, aged down after having been cursed by the Heart-Pluck Willow. His name is a homophone for 吓死你, "to scare you to death". As opposed to his actual younger self, he's usually dressed in blue hanfu and can be seen interacting with the teenaged versions of his three disciples.

This tag implicates chu_wanning (learn more).