If you've not played it King Oddball is a great little mobile game, small and free on android at least, handy if you have limited space and just want something to waste away a little time while you wait for a bus/friends.

Pornhub VR ;)

No, seriously: WhatsApp (every day), Navigon, Play Music (own music library, no subscription), Alarm Clock (every morning), Browser, Steam Authentificator (also for chatting with my Steam friends), calender, GMail, camera app

Youtube and other streaming stuff only when I have WLAN, I try to keep my mobile traffic low.

Always running in the background: PayPal (instant notification of any money transfer), eBay (when I'm buying or selling something), weather app

Currently playing on my Z5 Compact: Chameleon Run (one of the best endless runners, very cheap in the current Humble Mobile Bundle), The Room Three, Rayman Adventures. If I connect my DualShock 4 via GameClip: GTA VC & LCS.

Currently playing on my iPad Air: Deponia, Severed & The Whispered World.

Massenger, YouTube, Pokemon Go and Show Box are my most used apps. I have a couple of games installed which I play every now and then as well.

This weekend I visited my sister in Sweden and my little nephew showed me Piano Tiles 2.
Played a few times during a road trip with him, and obviously he was super impressed with my first try l33t skillz

Funny little app. I have returned to it these past few days.