Your in-depth ideas to make each Sim more unique!

In the current set up I think not matter what I do my sims are basically the same if I'm not dictating their actions OR haven't given them traits that take things overboard.
I would love to see them implement a fatal flaw system like they did in TSM also I think the horoscope system would help too like when we are able to use the slider to determine how neat, outgoing, and active they were (I forget the other things)