Are there classes of Kagune or they are all differents?
There are four different kagune types, which depend on kakuhou position in body:



Ukaku - fast kagune, capable of distant attacks, but ukaku ghouls get tired quickly due to RC cells depletion;
Koukaku - high density kagune, heavy, hence slow, but with high defensive capabilities;
Rinkaku - flexible kagune in form of tentacles, good for close combat offense, but not really sturdy. Its owner also has improved regeneration.
Bikaku - kagune with balanced speed, offensive and defensive capabilities.


Hinami is one of rare exceptions, she is Chimera, having hybrid kagune. This is really rare type of kagune.