Ghouls have lived in the shadows for as long as they’ve existed. 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 color in darkness, only shades of gray.

Ghouls must consume human flesh in order to survive. If you fail to consume a sufficient amount of meat (equivalent to one humanoid creature's worth of flesh) over a period of 28 Days, you gain one level of exhaustion. If you consume a humanoid corpse in a 24-hour period, the exhaustion level is removed, and you feel refreshed if they fail to eat within that 24 hour period they have a chance to lose their self in the hunger must make a 15 con save minus the level of exhaustions. Aghast with their hunger, many ghouls struggle with the morality of consuming others, leading to internal conflict and story opportunities. 

When a ghoul eats human Flesh they regenerate/heal 1d6 per Lbs 

they cannot consume anything else besides Coffee or water if they want to eat something else they have to preform a performance check not throw it up and convince them there eating but the Ghoul must throw the food back up within an hour or they will enter a weakened state and not be able to use there Kagune 

Rinkaku

The Rinkaku kagune is known for its agility and strength. This is characterized by a large number of tentacle-like appendages that grant them incredible mobility and power.

• Ability Score Increase: Your Dexterity score increases by 1.
• Tentacle Mastery: Your Kagune manifests as multiple tentacle-like appendages. When you use your Kagune to attack, you can make an additional unarmed strike as a bonus action, dealing 1d4 bludgeoning damage. The range on the main action attack is 10ft and deals 1d6 piecing or bludgeoning 
• Acrobatic: You gain proficiency in Acrobatics, and you can attempt to escape grapples or climb faster. You can use your Kagune to climb at a speed equal to your walking speed.

Koukaku

The Koukaku kagune is a more defensive and sturdy type. Its characteristics make it ideal for those who prefer to withstand damage and protect others.

• Ability Score Increase: Your Con score increases by 1.
• Tough Hide: Your Kagune manifests as solid, armor-like plates. You gain a +1 bonus to your Armor Class (AC) 
• Shielding Strike: When you hit a creature with your Kagune, you can choose to impose disadvantage on that creature's next attack roll against a target other than you, as your Kagune deflects or blocks an incoming blow. deals 1d8 when attacking with this Kagune

Ukaku

The Ukaku kagune is more speed-focused, with wings or wings-like appendages that provide an ability for flight and ranged attacks.

• Ability Score Increase: Your Dexterity score increases by 1.
• Wings of Flight: You can cast the Feather Fall spell on yourself at will, without expending a spell slot.
• Rapid Fire: When using your Kagune to make ranged attacks, you can make two ranged attacks as part of one attack action. The second attack is made with disadvantage. deals 1d4 piecing damage 
  

  Bikaku
  

  The Bikaku kagune is more power focused, with the Kagune coming out of the lower back and normally attached to the legs

• • Ability Score Increase: Your Strength score increases by 1.
  • Tail Sweep : Once per short rest, as an action, you can use your Kagune to perform a sweeping tail attack. Each creature within 10 feet of you must succeed on a Dexterity saving throw (DC 8 + your proficiency bonus + your Constitution modifier) or take 2d6 bludgeoning damage and be knocked prone. Creatures that succeed on the saving throw take half damage and are not knocked prone.
  • Short reach high power: must be within 5ft to attack dealing 1d10 bludgeoning damage can only make one attack per turn