Your main is now a Dark Souls boss
What does the description of their soul read? In case you don’t know: in Dark Souls, defeating a boss awards you with that boss’ soul, which comes with a item description often gleaning insight into their character, and can be converted into two or three unique items, typically the boss’ gear.
For example, for my main,
:
** Soul of Sion, Undead Juggernaut:** A twisted soul steeped in strength. A churning mass of vermillion and sanguine, constantly reshaping itself with great strain. Its conflict is evident of a soul too long damaged, forced too long to live.
Centuries past, Sion was a mighty general who perished in defense of his country’s capital, but not before breaking the enemy nation’s will. In life, he sought nothing more than the expansion of Noxus. In death, the hunger remained, but a new craving took root as well: A desire for release.
Sion's Axe: The brutal weapon of Sion. Though it still holds an edge after centuries, it can crush an opponent just as well beneath its immense weight. With it, Sion could even rend the earth with ease.
Sion shunned swords, believing they lacked heft.
Go.

Soul of Azir - Emperor of the Sands.
One of the twisted souls, steeped in strength.
as Black Plague Singed would actually be an interesting Dark Souls boss.
! We are all doomed!
(disclaimer: using some of Wukongs Journey to the West lore for some extra color :p)
would be intresting to see maybe you would have to kill him in a certain time frame or else he will always comeback
Ok i thought of something
isn't my main, but the inspiration hit me.

sit in top bush and gank over and over because all the junglers on her team are busy farming saying its not their job to help her.
I don't play Dark Souls, but I don't think she'd really fit in. >.<
They would be an interesting one.