I think you should create separate display form for the lookup column list. So when you click on the Employee name, it should redirect to your created display form of an item. In that you can have your custom columns whichever you want.
You can create new display form using SharePoint Designer for any particular lists. So when you try to open the list item details, it will be displayed on the from. Refer this link:
Create custom list form using SharePoint Designer.