I just recently got my first iPhone and I want to have an app that I don't know if exist?

I want to Siri to sound like Hall 9000 I wanted to have that boys but replaced sherries forest with Hall

I highly doubt it. Apple doesn't allow any app that changes the functionality of their devices. I think the best you can do is to change the language settings of the phone and/or change to a male voice.

No you can't change Siri's voice (to that extent anyway)