The Jhin connection people seem to ignore.
http://i.imgur.com/nT7UkYT.jpg
So this is Jhin, supposedly. Now, unlike some of you guys, when I saw his outfit I didn't think Fiora. It seems Demacian, sure, but....
http://na.leagueoflegends.com/sites/default/files/upload/pvp.net/lucian_pvp_13.jpg
Note the ornate armor. The angular designs. The sharpness of the outfit.
"But it doesn't look that close. There's not enough to-" Now consider Jhin's weapons. In the virtuoso teaser, Jhin was using guns...but not ordinary guns. Magical guns with elemental and powerful properties. Weapons far more smooth and refined than something Piltover or Zaun could produce. Now consider the text in Mind of the virtuoso:
I will make you beautiful. I will make you perfect.
What's Lucian's job? A purifier. THE purifier, or so we think. It's entirely possible Lucian comes from an order of warriors who combat the darkness. Of course, this is not without sacrifice. Lucian lost his wife.
Jhin, on the other hand, has been battling far longer. He's lost his arm and his visage from these wars. Slowly, over time, madness crept into him. It was subtle at first, balking at his fellow purifiers. Saying they were "too lenient" with the darkness. Only when Jhin committed his first mutilation of a fellow purifier was he expelled from the order.
But that's ok. They were wrong. They were flawed.
Jhin is a reborn purifier. The truest purifier in this world. He doesn't just attack undead, he deals with things that must be killed before they get out of hand. The shadow master had fallen to darkness, he must be killed. The maven killed her mother. That crime cannot go unpunished. The knight was blinded by his country, Jhin showed him the light. The enforcer lived a sinful life of debauchery, it was only right that she be reborn as something beautiful and noble.
TL;DR Theory is that Jhin is an ex-purifier from the same order as Lucian. Warring with darkness has made him unhinged and have an immensely strict view of what purity truly is. Such is why his armor is a tattered but ceremonial outfit and his weapon an ornate gun with magical properties.