Nile has 2, so if you got both you should be good, To get Poppi you need to play the minigame and win!
So poppi only has one as of now? Good to know. I was about to spend around too much time trying to find easter eggs or some secret stuff to unlock more. One more thing though if its all the same with you. Is the shark girl on the poster in the office talking about a concert a tease to a future character?