The Changelings are an often hated race, somewhere between a sapient pony and an insect, that feeds on the love from others, and has to remain hidden to survive.

Goblins for the Goblin Throne

A Geezer (proper noun) is the male version of a Hag. They are not related to, nor do they interact with Hags.

A monstrous race encountered in the depths of the Gygaxian Gyre, beneath Tarrasquestone

also known as an eye-pillion, dungeon sneak, or the most common Eye Spider

A haint is a pursuing ghost, or a ghost that follows or chases the living, and comes from Southern vernacular. In the fantasy setting, a Haint is a semi-corporeal entity that exists, but is neither alive nor dead, and not undead or constructed. They are an enigma.

We made a mistake, we assumed they were normal goblins, short and cranky as they were. We thought the horns were some sort of decoration or one of their fetishes. The horns were attached and they were much more than mundane grots. They were hell grots. 

An ancient race of nearly-humanoid spiders that have lived on the fringes of civilization for as long as recorded history.

"AAAAAAHH, it's a troll!"
"Protect the women and children! Grab your torches!"

"AAAAAAHH, it's a troll!"
"****head... we banned him five times and he keeps making new accounts about how he pwns all and that he>>>>>>>>>>>>>>>>>>>j00!"

also known as a great goblin, dread goblin, or super goblin

The Karkos represent an attempt to create a bad guy race with almost no redeeming features, a true villainous species without resorting to established tropes or handwaving.

Hell Hags are thankfully rare, incredibly rare, and the appearance of one means that the world has net decreased in number of hags by two

Behold, a magical pig

A horde of devious, ferocious, tenacious, and atrocious creatures, beasts, and monstrosities to populate the northern realms of your fantasy. Get them while they're cold!

Appearing as mutilated humanoids with large heads, Nihilids are terrifying to encounter. They are thankfully rare.

Seven Mermaids, some of them living their lives in the deep ocean, others, willingly or otherwise, on the land.

Youth passes quickly for this race of elves, though middle age lingers for millennia. They have no love for the forests or other natural places, preferring their carefully crafted and tended walled cities.

The powerful barbaric spawn of The Panther God

Freetext Friday barbarian (but mostly because I can't sleep)

The two of them peered down at Erath menacingly through the trees. He rested his palm on the jeweled hilt of his sword, ready to cut one of them down the moment they touched the ground. With any luck, he could swing quickly enough not to find a dagger in his spleen. What he wasn't expecting was the sharp, discordant noise behind him. Whipping around, it was a third creature, gripping a violin in its spindly, sinister hands. Sweat still beading down his forehead, Erath looked down to the poorly scrawled sign at its feet, reading: 'Will pley 4 gold.'

The common Dragon is seen as a Monster and a Beast; whether that is true or not, is an entirely different matter.