He was sentenced to death in 2012 for stealing medicine but was
rescued by Empress Tianzi, and later promised her to take her out of the
Forbidden City. Xingke is extremely skilled in swordsmanship and always
carries a sword at his waist. His knightmare pilotting skills are shown
when he pilots the Shen Hu, an experimental knightmare developed by the
Chinese Union. No one was able to pilot it, yet Xingke can pilot it well.
He is said to be Lelouch's equal in strategy and Suzaku's equal in combat,
and even Lelouch acknowledges him by saying why did heaven give him both
gifts. Unfortunately, he has an unknown illness that is slowly killing him,
and only a few know about it.
His loyalty to Tianzi is unmatched, as she was to marry Britannia's
First Prince Odysseus, he and the Black Knights intervened the wedding.
However, he dislikes the Eunuchs because they are dishonorable. He first
kills Gaohai and takes in the Black Knights, so that they have a place
to hide while Britannia is looking to get them.
Although the show never revealed what illness he had, we have
an idea of what it could be. Li Xingke has, on several occassions,
been coughing blood, with his hand across his stomach. (R2 Ep. 8)
Thus, we've come to the conclusing that the illness killing him is
cystic fibrosis. After much research, it is determined that his
symptoms closely represent that of cystic fibrosis.
(Info by Lexie D)