I'm currently playing Injustice, Brave Frontier, and Real Racing 3, Crusaders Quest. These 4 games are enough for wasting my time, and these are my recommendations:

Injustice Mobile is an action/arcade game, and you might need to have a good android or apple phone to run it smoothly (size is around 1.2GB). You'd like this if you want awesome graphics, and into DC Comics and games. You can link it to Injustice in PS3/4 as well to unlock goodies

Brave frontier is a more casual, luck based rpg game. Basically you summon, fuse, and level up your units to make a formidable team to fight in the arena(end game). i've played it for more than a year now, and it's quite addicting. Although I stopped a few months and a lot has changed. For some reason it became tougher to get stronger without spending real money on it.

Real Racing 3 is a racing game (duh), and like injustice, it's a spec-heavy game as well. The car customization is simple enough for casual gamers, and the car lineups are magnificent.

Crusaders Quest is a new game (i think), I just played it, and the feature is quite interesting. It's an 8-bit game, and it brings back my childhood memories. Pretty fun for an puzzle action rpg game. I've only played it for a few hours, and a bit buggy, but I liked the storyline.