I love how Ulquiorra build have stats that support each other.

His weapon's stamp:

• Increase Ultimate Charge Rate by 40%. For every extra 1% Ultimate harge Rate increases Crit Rate by 0.4%, up to a maximum of 55%

Passive Boost 2

• For every 1% Crit Rate Ulquiorra has during battle, his DMG increases by 0.5%, up to 50%

Passive Boost 3

• When Crit Rate exceeds 100% during battle, every 1% beyond is converted into 2% extra crit DMG.

Ideally, his stamps should be Atk%, Crit Rate, and Ultimate Rate.