Homebrew Ghoul - Tokyo Ghoul Species Details

 it is theorized that the Ghoul race came to be hundreds of years in the past after an unknown individual first underwent an explosive reproduction of RC cells and experienced a Draconic appearing transformation which some believe to have been the mortal god Lernaea, releasing spores that mutated a number of humans into ghouls.

Features

• Ability Score Increase. Your dexterity score increases by 1.

• Age. Ghouls mature at the same rate as humans but can live a few decades longer on average.

• Size. Ghouls are about the same size and build as humans. Your size is Medium.

• Speed. Your base walking speed is 30 feet.

• Darkvision. Thanks to your Kakugan, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern colour in darkness, only shades of grey. and this feature is only present while kakugan are displayed

• kakugan's nature. the ghouls defining feature kagugan, manifesting in the eyes as red irises surrounded by a black sclera they appear to those around them as unnatural and imposing and therefore while active people will treat them like with caution and fear some with prevalent hostility, an affliction manifesting in the eyes as red irises surrounded by a black sclera. A ghoul's kakugan can appear either by their own will, due to hunger, or when using their kagune.

• Languages. You can speak, read, and write Common and one other language 

Diet

A ghoul can only feed on humans and other ghouls. They are unable to digest any other type of food due to a particular enzyme their bodies produce. The structure of their tongues is also different from humans', making other foods taste disgusting and uncomfortable. If ghouls attempt to eat normal food, they will be struck by a powerful urge to vomit. While ghouls cannot eat normal food, they are, however, able to drink coffee (and eat the beans) , as well as regular drinking water.

Biology

Ghouls have a high physical capability and are four to seven times stronger than the average human: they are able to send the average human flying if struck with enough force, and can penetrate a human's body with their bare hands. They are also capable of jumping to heights not achievable by a regular human. Ghoul senses are much keener than those of humans (dark vision) They can smell people or meat from afar and tell humans and ghouls apart by their scent.

They possess an organ known as the kakuhou, cells harden and break through the skin to form the kagune. The kagune is a hard, muscle-like protrusion described as their claws. It can take the form of a pair of sharp wings, tentacle-like appendages, a tail, or a blade-like object, and can even be detached from the ghoul. 

Healing

Ghouls have a strong regenerative ability: small wounds and fractures heal with a single short rest (see regenerative trait) .Larger wounds take longer to heal, but will usually vanish after a few days, as long as the ghoul has access to an adequate food supply and time to rest. 

Ghoul - Tokyo Ghoul Traits

Kagune - A kagune (赫子, red child) is a ghoul's predatory organ and functions as their weapon and claws. It is usually as red as blood and have a variety of types- Ukaku - kokaku - Rinkaku - Bikaku

Exhaustion - nerf

the ghouls will receive detrimental effects after dropping below half health that will stop once the ghoul has finished a long rest and eaten a portion of flesh: 

the ghoul will move as in in difficult terrain

the ghoul cannot use proficiency bonus for any abilities

the ghoul cannot control their kakugan (black eyes) and they will remain prevalent to those around them

Kagune

The kagune is a hard, muscle-like protrusion described as their claws. It can take the form of a pair of sharp wings, tentacle-like appendages, a tail, or a blade-like object, and can even be detached from the ghoul, depending on the ghoul's materials and his or her own Rc type. there are four variants which can still manifest as diversely as a wizards spell book: ukaku - koukaku - rinkaku - bikaku 

Chimera

additionally some ghouls are chimera ghouls. (In extremely rare cases, a ghoul whose parents possess different types of kagune will inherit properties from both from their parents. This results in a ghoul that possesses a kakuhou in more than one location and is able to use two different types of kagune, a chimera kagune. however this will be a blend and not a full double in strength losing some benefits from the other). 
to play this chose one attack from a kagune and one ability form the attack kagune and one from the other, or two from the other kagune.

Regenerative

Ghouls have a strong regenerative ability: small wounds and fractures heal in a shorter amount of time. Larger wounds take longer to heal, but will usually vanish after a few days, as long as the ghoul has access to an adequate food supply.
if less than half of the Ghouls total HP is gone then per short rest heal for (2d4+ half class level) extra to any other healing
however if more than half of health is gone heal for (1d4 + half class level + constitution modifier) extra to any other healing