Ghouls live off human flesh and blood, and if they don't eat every once in a while, they'll lose control of themselves. Ghouls can also drink coffee as a temporary replacement for flesh and blood.

The kagune's appearance and the place of emergence on the body depend on the Rc type of the ghoul. There are four different Rc types: ukaku, koukaku, rinkaku, and bikaku. As a guideline, each type can characteristically subdue another type, although it may be different for two specific opponents. Each Rc type has a set of strengths and weaknesses, each one unique to its type. 

Ukaku
An ukaku kagune (羽赫, ukaku, "feather-red") is spread out like feathers and is released from the shoulder area, it specializes in high speed attacks, most of the users seeming to have highly enhanced speed. The kagune is lightweight and can be used to deliver high-speed attacks against an adversary, the primary method of attack is crystallizing their kagune to deliver a high speed torrent of spike-like projectiles, however whilst crystallized they are much stiffer and cannot be used for short range combat; at least one ukaku-type can generate powerful lightning-like bolts, a possible rare ability. While the kagune is suited both for short-distance and long-distance attacks, short-range is considered their weakness.[2] They may use their kagune as a shield and several are capable of shaping them into sharp blades reminiscent of a koukaku to aid in close quarters. Many ukaku-types are able to increase the flexibility of their kagune for short-range combat, though this makes it ill-suited for their distinctive long-range attacks.

Koukaku
A koukaku kagune (甲赫, kōkaku, "shell-red") is released below the shoulder blade. Due to its high density of Rc cells, it is heavy and extremely robust, giving it the greatest sturdiness and making them very well suited for defense. Normally, they are generally shaped into armors or shields, but on the offense, they can be shaped like melee weapons such as drills, hammers, blades, and swords.

Rinkaku
A rinkaku kagune (鱗赫, rinkaku, "scale-red") has an appearance similar to scaled tentacles and is released at the back around the waist. A rinkaku wielder has powerful regenerative abilities and some could even survive the most critical of damage. Its peculiar appearance and structure yields superior striking power and they excel in brute strength. Some rinkaku users are able to manipulate the shape of their kagune, such as changing its usual tentacle form into swords or claws.

Bikaku
A bikaku kagune (尾赫, bikaku, "tail-red") typically has a tail-like appearance and is released around the tail-bone/coccyx. It is good for medium-distance attacks and has decent offense, defense, and speed. Thus, they have no notable strengths or weaknesses like the kagune based on other Rc types, meaning the kagune itself is treated as a surprise "trump card." The number of tails a bikaku user can create is usually one, but some can create more.

You gain proficiency in one skill of your choice.

You gain an Origin feat of your choice.