The Sims 2 Guide and FAQ

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1.3 Your Sims' Personality
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Your Sims personality will effect the way you Sim lives and how they are 
effected by the events going on around them and the interaction they make with 
other Sims and items.

There are five parts to your Sims personality. Sloppy/Neat, Shy/Outgoing, Lazy/
Active, Serious/Playful and Grouchy/Nice. Each of these parts is made of a scale
from 1 to 10, and depending on its Value will depend on weather it is Sloppy or 
Neat. 

Here is a little about each of the Personality Traits.

Sloppy/Neat
    Sloppy Sims are just that, sloppy, they will not clean up after themself, 
    or make there beds. A neat Sim will always wash the dishes after eating, 
    and make the bed after getting up. If your Sim only has a few neat points, 
    around 4 - 6 they will some times clean up, to take out the trash, and 
    maybe even flush the toilet.

Shy/Outgoing
    A shy Sim although still needing some social interaction won't really want 
    to join in on activities, and their social bar will not drop very fast. An 
    outgoing Sim needs to have people around and will want to have parties. 
    Great for Popularity Aspiration Sims, you will have to watch the social bar
    closely or your Sim will not want to learn any Sim Skills.

Lazy/Active
    A lazy Sim want to lounge around and watch TV or relax and read a book to 
    have fun. Whereas a active Sim will get more out of dancing, working out 
    and other activities like swimming. Take note of this as it will help 
    working out what is best to increase your Sims fun levels.

Serious/Playful
    Serious Sims don't like to 'play' with other Sims. They don't like to tickle
    or be tickled etc. A playful Sim will get more social rating out of the play
    options (Tickle, Red Hands) than a Serious Sim.

Grouchy/Nice
    This is an easy one, a grouchy Sim will be hard to get along with other 
    Sims, and a nice Sim will get along with anyone. Grouchy Sims will find it 
    hard to make and keep friends, and nice Sims will make friends easy. Other 
    non-player controlled Sims will react to how grouchy/nice your Sim is.

Your Sims personality and the Value of the 5 personality traits will effect what
Zodiac Sign your Sim is given. When making your sim you can also select the 
default personality of each of the Zodiac sign. 

Your Sims Zodiac sign will affect the way your Sim interacts with other Sims. 
See the Zodiac Sim Compatibilities table in section 5.6