Active: Wilros fires a volley of bolts in front of him, each bolt in the direction of a nearby enemy. Enemies can only be damaged by a single bolt. Wilros's basic attacks reduce the cooldown of this ability by 1 second.
I've seen the forums asking for a Demacian AD carry. While people have proposed Vayne, she is a vigilante and is as much Demacian as Riven is Noxian; and Lucian is another independent that happens to be Demacian.
Wilros is Queen Catherine Lightshield's (née Spiritmight) brother, making him Jarvan IV's uncle. He's a savant of the Demacian military: a sage and powerful wizard. This relationship isn't relevant to the champion's persona, merely backstory. I feel this champion should be of a noble house.
I scoured through the thread and the general opinion was that, if we're going to have another AD carry, they shouldn't wield a bow or gun. The solution seemed obvious: a staff. I think he should wield a sword as a secondary weapon; here's some battle wizards on DeviantART: