This section will explain all areas that are specific to each class. If a section does not pertain to you or your character, feel free to skip it. While all of the specifics cannot be listed here, the most general rules and guidelines are listed. If you have any questions, again feel free to PM a mod or post it in the questions thread.
( Humans ) Spiritual Power
The "Spiritual Power" for Humans is their special attribute. This is completely different from the status "Spiritual Power". Their special attribute is basically an ability that makes them unique. It can be anything from being able to control an element to manipulating electronics. It is like a free 25 level custom. Rules on making the human spiritual power can be found here.
Their class abilities can be found here, at the Spirit Dojo.
( Shinigami ) Zanpakuto
The basic weapon that all Shinigami have is the "Zanpakuto". Thus, every starting Shinigami will have a Zanpakuto, but they will not know its' name. That means that it will be a normal sword until your total Reiatsu reaches 50 (you unlock your Shikai at this point). Similarly, you will not be able to use your Bankai until you get 50 status points in one stat. All Zanpakuto's must be approved, and you can do that (and find the general rules for making them) here.
Their class abilities can be found here, at the Shinigami Academy.
( Quincy ) Quincy Cross
The Quincy Cross is the basic medium through which a Quincy draws spiritual energy to form their bow. Each Quincy starts off with a regular Quincy Cross with no attributes. As they increase in power, they can change their Quincy Cross here. The Quincy Cross section of a profile does not need changed at all by you.
Their class abilities can be found here, at Souken Falls.
( Hollows ) Spiritual Powers (3) & Special Attributes
Spiritual Powers for Hollows are three abilities that your character starts out with from the start. They can be anything from shooting energy beams from their mouth to being able to jump really high. The Special Attributes are physical or other characteristics that distinguish your character from other Hollows and are for aesthetic purposes only. All of these need to be approved here. That thread also explains the basic guidelines for them.
Their class abilities can be found here, at Muchos.
( Bount(o) ) Dolls
A Bount really holds no true power at first other than their ability to control a single "Doll", which is a separate being from itself. This being can take any form; from a human to an inanimate object. They acquire one simple level 25 custom. You would need to create your Doll and have it approved here. The Doll's ability will need to be approved in this thread, however. Please make sure to post in the correct areas!
Their class abilities can be found here, at Kariya Cavern.
( Mod-Souls ) Specialty
A Mod-Soul gets a single special ability to start out with. It is equal to a level 25 custom, and needs to be approved here. This ability can be anything from controlling an element to transforming into a small bug. They also can have a simple weapon (with no special abilities), but it is optional.
Their class abilities can be found here, at the Warehouse District.
( Shinobi ) Elements
The Shinobi are ninjas who base their power off of the elements. Upon first creation, they need to choose a base element. They will only be able to learn the skills that attach to that element, so make sure to choose wisely. They can be found here. They also get a special ability known as their Elemental Power. It is equal to a level 25 custom, and must be approved here. The Special Attributes are RP only things that relate to their element. For example, if their element is Fire, then their special attribute might be being able to walk across fire easily.
Their class abilities can be found here, at the Hidden Village.
( Blank ) Spiritual Power
The Blanks get a very basic ability known as their "Spiritual Power" that is equivalent to a level 25 custom ability. They must be created and approved here.
Their class abilities can be found here, at Stonehenge Circle.