Obviously Questionable Content. It's still great, in fact it's only gotten better with age, as Jeph has continued to grow and mature as an artist and a writer. If you're getting into it for the first time, power through the first few hundred strips (as in, skim read as required), the journey is well worth it.

Gunnerkrigg Court is a fantastic modern fantasy adventure. Imagine a kind of really weird, really offbeat take on the whole "Kid gets sent to a magic school" genre. It's one to read from the beginning (it has, like, actual plot and stuff), but the best possible "trailer" I could give is this one page from the start of Chapter 14; no spoilers, just a really good glimpse into what this comic is like. Friendly ghosts, goofy robots, and malevolent trickster gods abound.

Finally, I absolute have to recommend Seemingly Dark. Disclaimer; Jules, the writer and artist, is a friend of mine. That being said, I'd recommend this even if she wasn't. Jules is an amazing artist, with a real skill for creating interesting, believable, and likeable characters. It's a modern horror gothic noir about ghosts, monsters, and struggling with anxiety and depression (and lots more things besides; I'm probably doing it a disservice with so reductive a pitch). Anyways, I really do think everyone should give it a look.

(As an aside, all three of these comics prominently feature LGBT characters, for those of you who are looking for a little more representation in your reading life).