Special qualities:
Each class has special qualities or limitations attached to them. Hybrids are assumed to have weaknesses and strengths based on the form the hybrid takes, adopting the weaknesses of the base, and breaking limits of their normal form based on their hybridization. Exceptions occur.
The bonuses for each standard class are as follows:
Shinigami:
Reiatsu qualities: Capable of crushing, single element only.
Hybrids: may combine with demon, hollow or quincy.
Techniques: Shunpo, kido.
Weaknesses: If zanpakuto hilt is destroyed, zanpakuto power is permanantly lost, powers are single-themed.
Other: Powers manifest in a zanpakuto
Hollow:
Reiatsu qualities: Capable of crushing, up to two elements
Hybrids: may combine with demon or shinigami
Techniques: cero, hollow powers
Weaknesses: if mask is destroyed, the hollow dies or is purified.
Other: Powers manifest internally, powers can be unrelated.
Quincy:
Reiatsu qualities: Non-elemental, non-crushing
Hybrids: can combine with human during life (rarely), or become a shinigami after death. Can theoretically be possessed by demons
Techniques: Hierenkyaku, quincy bow, Ginto
Weaknesses: spells require stored reiatsu, mortal, limited healing skills.
Other: Strength increases with proportion to the reishi density of the environment. Character sometimes continues after death. Only power is quincy bow.
Human:
Reiatsu qualities: multi-elemental, non-crushing
Hybrids: can rarely become quincy, can become a shinigami or hollow after death, can pact with demons.
Techniques: magic (sometimes), human abilities
Weaknesses: mortals, many feats needed to gain magic, no special speed skills.
Other: Adaptable, tough, feats grant extremely varied abilities, often lose/exchange feats upon death. Character continues living after death. Powers are related, and tiered.
Modsoul:
Reiatsu qualities: multi-element, non-crushing
Hybrids: can be constructed over time to resemble a shinigami. No other hybridization occurs.
Techniques: No special techniques
Weaknesses: weak characters, require a gigai, rarely improve after initial creation.
Other: Only possesses one standard power (other than elemental/reiatsu blasts) gigai can be modified, character, if defeated, pops out in pill form, and can only be killed if that pill is destroyed, do not necessarily require sleep, food, breathing, or other normal functions unless creator specifies it. (most often, they breathe, eat, and sleep, but do not require sleep.)
Demons:
Reiatsu qualities: multi-elemental, crushing
Hybrids: can combine with any creature other than modsouls.
Techniques: Kido, (added with 1/2 demon power, makes this especially effective).
Weaknesses: None.
Other: powers form both internally and externally, highly adaptable, powers can be unaffiliated.