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LoadAssetbundle.cs

using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class LoadAssetbundle : MonoBehaviour
{
	IEnumerator Start ()
	{
		var image = GetComponent<Image> ();
		var assetbundleNames = new string[] { "/character1", "/character2", "/character3" };

		// クリック待ち
		yield return new WaitWhile (() => Input.GetMouseButtonDown (0) == false);

		float time = Time.realtimeSinceStartup;

		// AssetBundleに格納されているスプライトを全部取り出す
		foreach (var assetbundlename in assetbundleNames) {
			var assetbundle = AssetBundle.LoadFromFile (Application.streamingAssetsPath + assetbundlename);
			var assets = assetbundle.LoadAllAssets<Sprite> ();
			foreach(var asset in assets){
				image.sprite = asset;
			}
			assetbundle.Unload (false);
		}

		Debug.Log (Time.realtimeSinceStartup - time);
	}
}