Creates a ghost effect by duplicating the provided GO. Used for dashing commonly.

GhostEffect.cs

using System;
using UnityEngine;

public class GhostEffect : MonoBehaviour
{
    [SerializeField] private GameObject ghostModel;
    private GameObject _ghostModelWithMaterial;
    [SerializeField] private GameObject ghostParent;
    public float ghostDistance;
    public Material ghostMaterial;
    public float ghostLife;

    private float _traveledDistance;
    private Vector3 _lastPosition;

    private void Start()
    {
        _ghostModelWithMaterial = Instantiate(ghostModel);
        _ghostModelWithMaterial.SetActive(false);
        ApplyMaterialTransparency();
        foreach (var r in _ghostModelWithMaterial.GetComponentsInChildren<MeshRenderer>()) r.material = ghostMaterial;
    }

    private void ApplyMaterialTransparency()
    {
        var alphaColor = ghostMaterial.color;
        alphaColor.a = .5f;
        ghostMaterial.color = alphaColor;
    }

    private void FixedUpdate()
    {
        var parentPosition = ghostParent.transform.position;
        var parentRotation = ghostParent.transform.rotation;
        _traveledDistance = Vector3.Distance(_lastPosition, parentPosition);
        _lastPosition = parentPosition;

        if (_traveledDistance < ghostDistance) return;

        _traveledDistance = 0f;
        var instance = Instantiate(_ghostModelWithMaterial, parentPosition, parentRotation);
        instance.SetActive(true);
        Destroy(instance, ghostLife);
    }
}

Example here