This is what I'm imagining would be his shuriken moves.
Shuriken Throw Ground:(B),F+P [LP fast, HP very fast]
Multi Shuriken Throw Ground: (B),F+PPP [3 consecutive shuriken, MP speed]
Shuriken Throw Air: (D),U+P [LP high angle, MP angle 45, HP low angle, all MP speed]
Multi Shuriken Throw Air: (D),U+PPP [Narrow spread of 3 shuriken, MP angle 45, MP speed]
Shuriken Barrage Ground: (B),F,B,F+PPP [3 consecutive narrow spreads of 3 shuriken each, 9 total, HP speed]
Shuriken Barrage Air: (DB),DF,DB,UF+PPP [3 Consecutive narrow spreads of 3 shuriken each, 9 total, MP angle, HP speed]
Just my two cents.