HI anirudh,
you can make a new List&Search Type where you search for the user content type.
In the Orderin tab you add the field User Id and set ordering to Descending.
This will give you a list of all users with the latest user at the top.
Now in configuration tab you set Limit to 1. This way the search returns only 1 result which is the latest user.
In the list tab you can choose a template (e.g. seb_blog).
In the item tab you assign your user profile picture field to the position you want.
Then you can save.
Now create a new module of type SEBLOD list and choose the Search type you created earlier.
This module you can place anywhere on your homepage.
I don't understand why you need to have a slider, because you want to show only the latest registered user. So you have nothing to slide.
Give it a try and let me know how it worked out.
Gerhard