The Parents of Darius and Draven
The following: 
and 
are fighters of Noxia. Both are fierce and strong warriors.
However, if you notice the traits of these two, you'll find something interesting.
has an ultimate move that looks like a dunk. No surprise there.
throws blades accurately, and fires an ultimate move that globally hits in the map.
Which brings me to my hypothesis of who their parents are: Their parents must be champions who shows traits of strong dunk-like attacks and hit accurate, possibly global, ranged damage.
Their parents must be 
and 
We can also assume that LoL is a timeless realm, where and come for a past time period, and were summoned into the LoL realm where time is not applicable. Which explains why, in their prime, they are able to be around their children, and , without knowledge of them being their parents. Heck, I don't even think is aware of being his wife and queen.
We can also consider that, although and are from Noxia, their origin story shows no evidence of their actual birthplace(s).
Therefore, and must be the children of and
