Looking for Computer Custom Keyboard App

I have been searching the forum for an app like this and i haven't found one yet so I decided to ask. I know that there are apps that make your Tablet a wireless keyboard for your PC. I want a wireless keyboard application that lets you do two things:

1. Allow you to use your tablet as a side keypad (num lock and numbers)

2. (optional) I would also like this app to be able to change what is written on the keys. (like an image)

If an app like this does exist I would like to know what it is. If there isn't an app I am thinking of posting this in the app suggestions category.