Cecaelia
A creature that is half man and half octopus is typically referred to as a "meroctopus" or "octo-man." These mythical beings are often depicted in folklore and fiction as having a human upper body and an octopus lower body.
Mermaids or Mermen
I think you're referring to the mythical half-man - half-goat creature called Pan.
A creature that is half bear half man and half pig.
It's either the merman(male) or the mermaid(female).
A Satyr.
A satyr which is a creature that is half man half goat.
Half man half horse Forward half was human down to the waist, rear half was horse from the shoulders down.
Grover Underwood from Rick Riordan's popular book series is a satyr.
Roman Mythological CreaturesHippocampus - is a creature that is half-horse and half-fishUnicorn - is a creature that is a horse with a long twisted hornCentaurs - is a creature that is half man and half horseSirens - is a creature that is half woman and half birdCerberus - is a creature that is a three head dog which has a snake's tailDryads -- tree spiritsFuries -- three female like bird creatures with snakes for hairHarpy - is a winged monster like creature, with the face of woman, and has the body of vultureMinotaur - is a creature that is half bull and half manKeres - 'Hounds of Hades' brought back evil doers for punishment.Fauns or Satyrs - is a creature that is half man and half goatSphinx - is a female creature that has the voice of a human, the head and torso of a woman, the paws of a lion, the body of a dog, a snake like tail and the wings of a bird
The creature that is half man, half horse on the TV show "Hercules" is a centaur. A centaur is a mythical beast from Greek and Roman mythology.
The half-goat, half-man creature in Narnia is named Mr. Tumnus. He is a faun who befriends Lucy Pevensie in "The Lion, the Witch, and the Wardrobe," the first book in C.S. Lewis's Chronicles of Narnia series.
A centaur is a half man/half horse creature found in Greek Mythology.