Is there a way to rotate Shuriken particles and have working normal maps?

I can't really give you a clear answer >.< But I can provide a solution! If you spawn them as actual objects, then they will for sure update the light on their textures. Now, I'm not exactly sure what you need... so I'm gonna provide an example where you hit a "trap" and then it spawns a bunch at an area and they start to travel before dying after a set time.

Here's the code for how to do it. (You'll have to apply this on an empty GameObject or somn with the "Is Trigger" set to True, in a Collider Component.

 using UnityEngine;
 using System.Collections;
 
 public class Trap : $$anonymous$$onoBehaviour
 {
     public GameObject ShurikenPrefab;         //Fill this in with the shuriken prefab
     public GameObject ShurikenSpawnPoint;     //Fill this in with the object you want these to spawn at from the Scene
     public float RandomSpawnRange = 5;         //This is subject to change (for tweaking in editor)
     public int NumberOfShurikens = 50;         //You can change this in the Inspector tab while in the Editor for tweaking
     public float Lifetime = 5;
     
     void OnTriggerEnter(Collider other)
     {
         //spawns a ton of shurikens (shuriken movement is handled within it's own "Controller" script)
         for(int i = 0; i < NumberOfShurikens; i++)
         {
             GameObject go = GameObject.Instantiate(ShurikenPrefab, new Vector3(
                 (ShurikenSpawnPoint.transform.position.x + Random.Range(0f, RandomSpawnRange)),
                 (ShurikenSpawnPoint.transform.position.y + Random.Range(0f, RandomSpawnRange)), 
                 (ShurikenSpawnPoint.transform.position.z + Random.Range(0f, RandomSpawnRange))), 
                 Quaternion.identity);
             Destroy(go, Lifetime);
         }
     }
 }

You'll have to make a Shuriken prefab to plugin to the script. Quad's are better than planes, cuz they are only 2 tris, ins$$anonymous$$d like 50 or wutever the planes are.

Here's the script for the shuriken prefab. If this isn't plugged in there, the thing won't fly :/ or spin...

 using UnityEngine;
 using System.Collections;
 
 public class ShurikenController : $$anonymous$$onoBehaviour
 {
     public Vector3 ShurikenTranslateVector;
     public Vector3 ShurikenRotateVector;
     
     void Update()
     {
         //applies the Translate Vector to the shuriken every frame
         transform.position += ShurikenTranslateVector;
         
         //applies the Rotate Vector to the shuriken every frame
         transform.localRotation += ShurikenRotateVector;
     }
 }

moved this over to a comment ins$$anonymous$$d, in order to clear out the answer section so somebody with a "real" answer can help you out :P