Gaara

Carries sand in a gourd so the technique never depends on the environment

Moves sand as an automatic defence without conscious direction

Controls sand carried in a gourd he never puts down

The sand shield moves without his conscious direction, defending him while unconscious

Crushes rock into fresh sand when his supply runs out

Desert Coffin encloses a target completely before compressing

The automatic defence is stated to be Shukaku's doing, not his own control

Raises terrain to reshape the battlefield rather than to strike