The game DOES have a storyline, REGARDLESS of whether or not YOU PERSONALLY like to read it. Some of us do give half a **** about lore, and just because YOU want to be OMGLOLSNIPZ doesn't mean you have to ruin the setting for the significant portion who DO care. Go play Kog'maw if you want to be a sniper, he fits the playstyle, just not the aesthetic you stereotype a sniper as.
As has been said, there are no futuristic champions in the game right now. There may be futuristic skins, but thats it. Steampunk =/= futuristic. Blitzcrank is put together with magic as much as with technology.