Some references you may have missed...
Alright, well, I have no idea if these are legit or not, but here is a small list of things I have noticed, and the IRL stuff that they may refer to. I will try to avoid obvious ones like Ragnarok, Cassiopeia, and "Why so serious?". Again, these are just my speculations. So, here we go:
Tiamat
We'll start with something many probably know. This thing is everywhere. It's an old school boss from D&D and Final Fantasy. It is also an alternate name for the infamous 12th Planet, aka Nibiru, in Ancient Astronaut theory. The supposed home of our advanced creators, the Anunnaki.
Not only is she half ghost, but she has a sword that "dispels confusion." So if you are a ghost, and she cuts you, then you are released from your woes and get to travel to nirvana. She actually has two blades though, and her primary is supposedly too long to be wielded by regular folks.
Urgot
Possibly a reference to the Salem witch trials. One theory suggests that, due to environmental factors, a hallucinogenic mold known as Ergot was growing on their bread, which could have easily replicated the symptoms they were experiencing.
Annie
For anyone else who's played Bioshock, you know how hard it is to look at this champ and not think of the little sister. The same is true in both games, too: she's not much without big daddy.
Morgana
From Italian, a Fata Morgana is when atmospheric conditions act like a refracting lens against the horizon, mimicking floating ships, castles in the sky, and various other mirages. They can occur on oceans, deserts, and polar areas, only in places where cold air has been trapped under hot, the opposite of normality.
Spear of Shojin
I might be reaching here, but this seems like a reference to shojin ryori, a Japanese vegetarian cuisine with its roots in religion. Given the item's OP strength, let's just go for broke and say that it's also reference to Scott Pilgrim, and how vegans have super powers.
Visionary author Marshall McLuhan is best known for his quote, "The medium is the message," but he supposedly gave this iconic line to Timothy Leary, who popularized it in speeches and a spoken word album. This is a perfect line for a hippie couple, and because it's in the midst of the very thing that these people were warning us against, it's so troll and probably my favorite.
Anyway, that's my time. Please feel free to add more. I would love to know what everyone else has found.