Generate random input values

Is there any plugins that’ll generate random content of an input as such for example:

I’m trying to make an input that will randomly generate a username every 5 seconds, this is to allow my users to do something on this website I’m making, I’m making an automated report system that’ll just generate random reasons, usernames and fields every 5 seconds if the number of reports counting is only 1.

If there are any plugins that will allow me to do so please do reply with the names of them.