I kinda like trippy stuff
Splice
Eufloria
Superbros: Sword and Sworcery
Then there are some more classic style RPGs like
Cardinal Quest
Hero's Call
Edit: Stunned I forgot "Speed"
https://play.google.com/store/apps/details?id=com.tesseractmobile.speedcard&feature=search_result
Ive loved this game ever since first playing it as a minigame in xenogears.
But personally, I would not even bother for emulators on either a cell phone or tablet. Unless of course they have magically sprouted physical buttons, D pad, analog sticks and shoulders.
While I know the devices typically have the horsepower, and I have seen examples of Android devices running them smoothly, Unless you are running it off a KIRF like JXD, Yinlips, Pandora, ect lacking physical controls will be more aggravation than its worth, making it not worth the effort.
PROGRAMS:
Personally I love Wikipedia offline, though it can be a PITA to get set up.
https://play.google.com/store/apps/details?id=in.bitmagic.wiki.offline
Trillian of course
Dropbox if you havent already set up a backup locker.
I like multi tools like Swiss Army knife
https://play.google.com/store/apps/details?id=com.digital_and_dreams.android.swiss_army_knife
A good flashlight.
Sadly for all the freedom in rudimentary program design and how you can use programs to turn your device into a different type of tool are woefully lacking and mostly due to lack of imagination on the part of devs.
Side note: Personally I am still trying to pin down some good programs to handle things like media management Like one consolidated program that handles music, video and image display in a logical manner as well as Root/super user.
Anyway, best of luck Hope some of these might help.
