Gunnerkrigg Court by Tom Siddell
"Within the first week of my attendance, I began noticing a number of strange occurrences. The most prevalent of these oddities being the fact that I seemed to have obtained a second shadow."
Gunnerkrigg Court (here -- the story starts here) is a fantasy/SF cross-over webcomic, which involves a rather odd school and features the past of Antimony, our heroine, plus shadows, robots, birds, a class project involving Greek Mythology, robotic birds, things bigger inside than outside, stopping alien invasions, psychopomps, Coyote, and other stuff.
Usually when you do a fantasy/SF cross-over you have to segregate them, so the logics don't contaminate each other. Or -- as Gunnerkrigg Court does, you can crank up all the tropes and make them run on being cool.
And it's an interesting sort of episodic. You have stories, self-contained and well-plotted. Except that sometimes they also are set-up for the future. But you can't tell when they are stand-alone and when not. Especially since the comic's still in progress so anything in the past that hasn't had an influence yet may yet.
