Xin Zhao has one of the longest base auto attack ranges out of all the melee champions, tied with Jarvan IV, Wukong, Fizz, Nautilus and Hecarim.
In the Chinese version of the game, Xin Zhao's name is rendered as Zhao Xin (赵信), as Chinese names are written with their family name first.
His name Xin (信) means "Trust" in Chinese.
"Zhao" in Chinese is a unique character, only usable as a last name.
He shares the family name of Zhao Yun (赵云), a famous general during the Three Kingdoms Era and a friend of Liu Bei. Like Yun, he uses a spear as weapon.
He may also be named after Zhao Xin, a Han general.
Xin Zhao is the only champion that references Asian culture but does not belong to Ionia.
Quotes
Xin Zhao's joke is a reference to the question, "What happens when an unstoppable force meets an immovable object?" This in turn is a reference to the Chinese word Maodun, 矛盾 (lit. spear and shield) which means "Contradiction".
In the German version of the game, Xin Zhao's joke translates to: "Find me an immovable object, so that I can bury you under it!"
Skins
Imperial Xin Zhao is likely a reference to the famed Chinese general Zhao Yun, whom Xin Zhao shares many characteristics with.
Viscero Xin Zhao is a reference to his time as a gladiator fighting in the Noxian arena, The Fleshing.
Winged Hussar Xin Zhao is a commemorative skin created to celebrate the launch of League of Legend's Polish servers.
Polish hussars were a type of cavalry fielded by Poland, and later by the Polish-Lithuanian Commonwealth in the XVI and XVII century. They were famed for their deadly charges.