Kiba: Add Katon to his fighting style. Fang over fang with fire. Tail Chaser's whirling fang making a fire tornado or something.
Shino: Add Doton to move the earth to gain more insects/ allow insects to move towards an enemy faster than they'd normally do. More control over more varieties of insects.
Hinata: See and manipulate natural energy with the Byakugan.
Neji: Strengthen his Byakugan and add Raiton. Allowing him to stun body parts with his Jyuken as well as propel electromagnetic waves via Air Palm.
Ten-Ten: Add Fuuton or Raiton to make her weapons fly faster, be able to change direction, or with Raiton become charged with electricity or serve as lightning rods for surprise attacks.
Lee: 7th gate. Basic use of Ninjutsu such as cloning. Dat turtle summon.
Sai: Suiton added to his Ink giving it resistance to rain. Also, his animals having the ability to use attacks themselves.
Shikamaru: Add Katon. The flame's shadow serving as a bolster to his shadow territory. The use of Shadows as a shield.
Choji: Already has the power you mentioned. Maybe Doton to armor himself similar to Kitsuchi.
Ino: Add some form of genjutsu using flowers, or poison based with flowers.
