Spooky indeed..

@xiton

You will find there is normally only one emulator per console apart from mame, playstation and maybe one or two others but not main ones.

Follow the links i put in my post they should point you in the right direction for most of them to read up on, then when you want to install them,

open app manager,
enable repositories extra devel and extra testing (using these repositories is at your own risk they sometimes come with bugs(not viruses) and could harm your phone read up on the app first)
go to download then click on all and type in the name of the emulator you want and click and install.