There's a WoW style phone game, but you can also play it on your PC via Steam.
AdventureQuest 3D. The game looks very good and it's easy to play. There are a lot of people that play, but they're just there. It's very much a single-player style game.
It's available for Android & Apple. And on Steam.
Give it a shot if you feel like playing a WoW style game, but you don't have a lot of time to dedicate.
Set up your character however you want. Looks are semi-permanent, but you can swap jobs any time via the game menu.
You'll see people classified by their character level and class level. Every class only goes to 10, and characters go up to 27 (I think that's the current cap). And there are 9 or more levels to play, but 2 of the levels require you to pay money to first access each of those classes. Aside from that, you don't need to pay, unless you want to speed up construction time of items, or ignore collecting ingredients.