code:

using UnityEngine;
using System.Collections;

public class Pawn : MonoBehaviour {
	
	public float Speed = 1.0f;
	public float AccelerationRate = 0.01f;
	
	protected CharacterController characterController = null;
	protected Vector3 moveVector = Vector3.zero;
	protected Vector3 shootVector = Vector3.zero;
	protected Vector3 _velocity = Vector3.zero;
	
	// some public interfaces
	public Vector3 MoveVector {
		set {
			//if (!PauseMenu.Inst.Paused)
				moveVector = value;
		}
		get {
			return moveVector;
		}
	}
	
	public Vector3 ShootVector {
		set {
			//if (!PauseMenu.Inst.Paused)
				shootVector = value;
		}
		get {
			return shootVector;
		}
	}

	// Use this for initialization
	void Start () {
		
		characterController = gameObject.GetComponent<CharacterController> ();
		Initialization ();
	}
	
	protected virtual void Initialization () {}
	
	protected virtual void PreUpdate () {}
	
	// Update is called once per frame
	void Update () {
		
		PreUpdate ();
		
		Movement ();
		
		PostUpdate ();
	}
	
	protected virtual void PostUpdate () {}
	
	protected virtual void Movement () {
		
		Vector3 targetVelocity = moveVector * Speed * Time.deltaTime;
		Vector3 deltaVelocity = targetVelocity - _velocity;
		
		_velocity += deltaVelocity * AccelerationRate;
		characterController.Move (_velocity);
	}
}