Ok, Like all other guys out there, I'm pumped about the next champ Lucian in production( Though I liked his title when it was "the Gun Templar"). But after seeing an overview of his past, I did see a few intriguing things. 

We all speculate the Lucian's Guns bear the Initials of Lucian himself and an unknown female partner that Lucian was close to. Their primary goal was to rid of all the evils in Runterra, including that of the Shadow Isles.....

Things get even more serious when they encounter a being  that supposedly "ripped her from my life". And so, Lucian is after Revenge. The question is, who is this being?

The story I read mentioned a male from the Shadow Isles. This is very vague as most Shadow Isle champs are unquestionably Male. Mordekaiser, Karthus, Thresh , just to name a few.

The second hint I encountered was that "I’ll hunt down the bastard who took her from me and send him straight to the grave". Again mentioning a male but something in that sentence caught my eye. The word Grave seems to have a greater sense of meaning here. So this aomehow narrrows things to Once Mortal beings. But the last clue I encountered was the closing Sentence. After "I’ll hunt down the bastard who took her from me and send him straight to the grave", the next sentence was:

Twice, if I have to. 

Now this caught my eye because it could mean the this being has the ability to ressurect himself immidiately after death. Even just temporarily.

And so I conclude that the Being in question could be none other than our resident Gravekeeper, Yorick Mori.

I mean, come on, a lot of the evidence points at him one way or another. But that's just my hunch....

Sorry for any mistakes, I'm from the PH servers. and below is a link to the site where I got my info