Abiku

That's an Abiku. 

One of the scariest Spirit in Yoruba Mythology. 

Abiku lived in the Jungles 

of West Africa like Nigeria 

and it was a Spirit of the Children who die before reaching a Puberty. 

The Abiku were shapeless Ghost-like Things 

and they possessed a Child whatever it's a Boy or a Girl by entering their Bodies to 

eat and drink would go to nourish 

the nasty Abiku within. 

Finally, they slowly waste away and died. 

The Parents of West Africa watched their defenseless young Children 

for any Signs of an Abiku. 

The Yoruba Parents had to make 

cuts in the Children's Skin 

and immediately rub the Cuts with Pepper. 

Therefore, the Pain drove out the Abiku and the Children were saved. 

But in The amazing World of Gumball Episode called “The Ghost”, 

Gumball didn't die by slowly waste away, 

he got fat after 

Carrie the Ghost possessed his Body, 

just like an Abiku in the African Mythology.