What I mean by my topic title is could one Sim have two different sets of traits, which could be triggered by a formula (I've wanted to play Jekyll and Hyde in The Sims 3 for a long time - I've just been too busy playing Skyrim and preparing for the new version being released next month.)
I'm basing these traits on both Henry Jekyll and Edward Hyde from the book by Robert Louis Stevenson and their appearance in The League of Extraordinary Gentlemen.
Henry Jekyll:
Genius (he's a doctor)
Good
Bookworm
Charismatic
Neat
Lifetime Wish: World-Renowned Surgeon
Edward Hyde:
Genius (he's got one part of Jekyll in him)
Evil
Athletic
Daredevil
Charismatic
Lifetime Wish: The Emperor of Evil
BTW, I am getting the PC version of The Sims 3 for Christmas, so if there is a way to create that Sim (or those Sims?) only on the PC, then that's OK.
In the meantime, I've considered the builds, and just making sure they do not appear together in public.