The partner thing would never work, my kind of fun and their kind of fun would not mesh. Them getting kicks out of saving the world while I get the kicks from playing a game where I save the world
So it would be the feature thingie... hmmm, being a Splicer would be awesome but just getting my hands on a shitload of tonics and plasmids would rock. Dead Space kind of AR would be awesome as well, but to get my hands on that I just have to live for the next 20 odd years. The parasitic suit with a personality that would override mine would not be a good option, neither being an insane capsuleer without the spaceships or the cloning facilities.
Maybe I'm going about this the wrong way...
Yeah, I got it.
I would love to be a faction leader of Alpha Centauri, or the god like thing from Populous.
Would you rather pick all your hair growing at a rate 10 times the regular or getting hungry 10 times faster?