Ragnarok Online--go out, kill mobs, earn money GTA--coz I can't do things from this game in real life Gundam--coz piloting a gundam is freaking awesome Eclipse War--morph into a monster, troll other people
Thief, as I simply love dark-themed eras and stories, cities and I'm also into stealth things and I always wanted to be an assassin in the Dark Ages. Or Dishonored, same reasons as Thief, just it isn't the Dark Age era.
Pokemon, with all regions available Warhammer 40k MGS3 and peace walker Recettear Faster then light Atom zombie smasher Shining force: rise of the dark dragon
Scribblenauts. Who wouldn't want to be that powerful?
Hum. I was gonna go with Starbound (easy building and you have an actual respawn, so you'd be able to die and come back), but Scribblenauts is a good one too.
Pokemon, with all regions available
Everyone tries to battle your Pokemon every time you walk in front of them. Also, you can't walk over 10cm ledges.
WHAT? Why could you possibly want to be there? It's a bonkers, corrupt, highly unequal theocracy/military dictatorship where billions of unlucky soldiers get killed in neverending wars with the scariest beings imaginable. Anyone stepping out of line can be executed pretty much without trial, and that appeals to you?