Although most NPCs are humans, some NPC bestiary descriptions, visuals, and quotes indicate that they aren't. This is the known list of NPCs like this:
-Demolitionist (Dwarf)
-Dryad (Dryad. Yep, this is confirmed.)
-Witch Doctor (Lihzahrd)
-Cyborg (Cyborg, as the NPC name implies)
-Goblin Tinkerer (Goblin, obviously)
-Truffle (Truffle, this is the confirmed name)
-Zoologist (Werefox)

As said in the previous section, the Zoologist is a werefox and not a human. On both full and blood moons, the Zoologist will transform into her other form once the moon rises and will transform back the next morning. This will alter both her sprite and quotes, making her sound uncontrollable. And yes, this also alters her forest happiness quote.

This is the sprite of her werefox form:

Blood moons do not only cause enemy spawns to increase, but also alter NPC quotes, even making most female NPCs rude. They will sometimes say things violent, annoying, corrupt, or in the transformed Zoologist's case, aggressive. The Party Girl is the only of them not to end up like this.

Some quotes from both the Golfer and Zoologist could confirm that they are sisters, alongside their shared skin tone. Some quotes include:
-The Zoologist saying she knew him since she was born.
-The Golfer on a blood moon asking if it's a blood moon or his sister (The Zoologist) on a blood moon that is scarier.

If you wondered how to unlock the Zoologist (Well, exclude the house requirement), it's simple: Get the bestiary progress to 10%/52 entries. This will let the Zoologist move into an available house.


And yes, are you traumatized after seeing multiple Zoologist-related stuff?

The world seed 05162020 generates a very strange world. Worlds created with this seed are not identical.
While 05162020 is generating, the background on the Menu will become that of the Glowing Mushroom biome, the Moon will become a glowing face from "The Moon, Venus and Jupiter will be aligned to form a smiley face on May 16, 2020" (which is also the release date for 1.4.0.1), all clouds begin to resemble Redigit's head, the generation descriptions and tips become random numbers that change every tick (except when "placing traps"), and the outline of the progress bar rapidly flashes between Corrupt and Crimson. When the world has been created, its icon shows a tree infected with both world evils, as opposed to normal worlds, icons of which show a tree that is partially infected with one of them.
While the seed is active, all music is replaced with it's counterpart from the cancelled spinoff Terraria: Otherworld, and both the Moon Lord Legs and Red Potion items can generate in Chests, and the Can Of Worms and Angel Statue items are more common in chests. The Party Girl replaces the Guide upon entering the world for the first time, both World Evils and ore variants generate in the world, and the Dungeon generates underneath a "dead" living tree. The dungeon itself is a reference to the popular YouTuber, Chippy's Couch, and will generate with the Chippy's Couch furniture. The Jungle Temple is painted green, and the Underworld will be inverted (the middle third will be a lava lake and the two thirds at the edge will contain structures). The world also generates an abundance of Living Trees.
The seed's number is a reference to version 1.4's release date, May 16th, 2020.

One easier way to find the Dungeon is this: The Dungeon is always on the same half of the world as the snow biome, while the other side has the jungle biome.

This is also my method of attempting to find the dungeon.

If the world seed is "Not the bees!" (Only write what's in between the quotations), the following changes will occur to the world using it:

The Forest becomes a Jungle, Hive Blocks replace Stone Blocks, Honey Blocks replace Sand Blocks in the Ocean, Hornet Nests and Larva can appear everywhere, the Dungeon is painted orange, the starting NPC is the Merchant, Queen Bee spawns at the edge of the world, all Water is Honey, and Hornets can spawn everywhere. The Desert and World Evils are not affected.

You may wonder 'Does the bestiary save for your character?'. Well, no, it doesn't. It is saved per world. This is likely because of the Zoologist NPC or to make it fair.