I thought I might provide some tangible numbers to a few things:
Evil:
What it does:
1] Be a bit better at the criminal lifestyle than other sims. (Bar goes up faster)
2] Donate to anticharities, granting the "Fiendishly Delighted (+15)" moodlet.
3] "Fiendishly Delighted" moodlet when relatively bad things happen to surrounding sims. Evil babies will become fiendishly delighted upon pissing other sims off with stench, crying, etc. Lasts for six hours.
4] Win moar in fights? Not enough to override a general lack of athletic skill, apparently, as my evil!sim failed to beat the tar out of her jocky classmates routinely.
5] May troll forums via a computer. Hooray! If successful (must check back later on a computer), you get fiendishly delighted: 1 ea. If failboat, get a 24 hours negamoodlet that is arooound -15 or so.
6] "Mastermind Plot" social. Seems to bore people almost every time used. Woo.
I have yet to have found a baby to steal candy from. Evil sims also do not get the negamoodlet when it's dark in the house.
Overly Emotional:
What it does:
1] Additional 25% effect to all moodlets, positive and negative. Useful!
Neat:
What it does:
1] Always clean up after self.
2] Extra sad when environs become dirty, I think it's around 20% more enturbulation.
3] Cleaning up is always an option, even if they are urine-soaked and dead tired.
4] As mentioned before, macrotasticaloid "clean house" floorclick option. Better than having to do it manually, but they always skipped over the nastiness in the fridge.
5] Many, many wishes cropping up to clean things. Goes well with neurotic, as that also brings up wishes to clean stuff.
IIRC the game text says that it makes them find cleaning somewhat fun, but it did not have a very noticeable effect on stress levels in the two neat sims that I had.
Mean-SpiritedWhat it does:
1] +10 moodlet when enemies are near, as opposed to the usual -10 moodlet.
2] Slightly better at fighting? Again, no muscles + Mean + Evil != better than some muscles. Jock's traits, are, however, unknown.
3] Enjoy being mean to people, wishes will routinely crop up to be mean, will autonomously be mean to just about anyone, even friends from my experience.
Comes with a handy li'l tally of how many enemies the sim has.
Fun Fact: An ambitious, mean, evil sim had a want, on his first day of work, to see the ghost of his boss. I am not sure what factored into that, and they did not have any lower than normal relationship with each other.
NeuroticWhat it does:
1] "Freak Out" -> go "nyyerrrraaaagh" and get a +15 moodlet for 8 hours.
2] Complain about things to anybody and get a +10 moodlet for a little while (2 hours?)
3] Get OCD (wash hands x3, brush teeth x3, also in x2 variations)
4] Lots of wants to clean things, make beds, etc.
5] Ability to check stove, tap, fireplace for a +20 moodlet for three hours. Sometimes gets a -20 (IIRC) "worried about _____" moodlet for 6 hours, which can be corrected by checking the ______.
6] Ability to talk about conspiracies. Woo.
LonerWhat it does:
1] -25 or so moodlet when around 3 other sims.
2] +15 moodlet with condiational duration when alone (infinite unless somebody comes and mucks it up).
3] Every now and again, wishes will crop up to be in a certain room for a certain number of hours. In my experience, it does not have to be the bedroom, as my first loner sim had the wish, stayed in the graveyard for 3 hours, and got it granted.
I've had
Flirty sims, which just get to be better at flirting (seems to lead to fewer rejections earlier on), I'm not sure what quantifiable difference there is with "great massage" v. "massage".
I'll post more when I get a chance. So apparently the paper+pencil icon is not "edit" but some mysterious other function. What a pisser.
GeniusWhat it does:
1] Faster learning is faster for logic and chess.
2] Ability to piss time down the drain via maths on the computer is available. Rewards range from roughly $100 to being laughed at. Takes quite a while!
3] "Deep Conversation" available, does nothing particularly remarkable. Geniuses can be complimented on their cleverness.
4] Geniuses will autonomously
Look Around and sometimes get a +20 moodlet for two hours cos they're FASCIMATED!! with something they saw.
ExcitableWhat it does:
1] +20 moodlet for three hours when seeing or experiencing something exciting. Exciting things include lovers and promotions, in my experience.
ClumsyWhat it does:
1] Trip randomly over absolutely nothing. No moodlets of any sort result. The only result is clipping through nearby walls and objects.
Ace.GoodWhat it does:
1] NEVAR!1 want to be mean to anybody, ever.
2] "Brighten Day" interaction gives, IIRC, a +10 moodlet for two hours. Similar to the moodlet gained when complaining about things to other sims.
3] Donate to random charity when clicking the mailbox, $100/$250/$1000. Moodlet is, if I recall, +15 and lasts for a day.
Great KisserWhat it does:
1] +15 moodlet for three hours upon ensmoochination for both the macker and the mackee. I did not notice it not applying in bed, though my sims woohoo and kiss there about as often as celibate octagenarians what "everything else" in the game taking so damn much time and the fact that you have to set the mood prior to sexytimes.
InappropriateWhat it does:
1] Shirk dress codes for parties and perhaps some other things. I did not notice shirking work dress codes.
2] Enjoy making fun of people and get many "late relationship only" options under "Special\Inappropriate...". Many more options for insulting people than mean and evil sims.
3] Alternative version of trolling forums, works the same as discussed under "Evil".
InsaneWhat it does:
1] Take about fifteen minutes to RNG up one outfit out of all available to the sim prior to going to any non-work venue. Boo.
2] Randomly do stuff that is actually not very nonsensical at all. Randomly eat a lot of fruit if it's in the sim's inventory.
3]
LOL RANDOME!1 social options, pretty much
all the special ones save for a few.
I did not notice any nonsensical wishes.
Green ThumbWhat it does:
1] Faster gardening skillup is faster, better harvests are better. Yay gardening.
2] Talking to plants is now an option. I am not sure what the hell this is supposed to do, since I've never run any tests to see its potential effects.
3] Revive plants is a
fat liecake, the only plants that seem to be revivable are death flower bushes. Only good for one additional harvest.
4] May enthuse others about gardening and brag about prowess with hoes.
Fun Fact: I never had a green thumbed sim autonomously talk to plants until I had an insane green thumbed sim. So, given EAxis views on "Insane" as
lol randome!1, maybe talking to plants does
nothing?
Natural CookWhat it does:
1] Faster cooking skillup is faster.
2] Will never enshitenate food (burn) or cause fires in the kitchen (hooray). Food always ends up being remarkably better than that made by plebeian unnatural cooks, with much less effort.
3] "Kick it Up a Notch" does just that, one quality level to the next. Perfect foods may not be kicked.
4] May do the following socials about cooking: enthuse, brag about prowess. Woo.
I'll add moar when I experience moar.
(Cze-cze can't do maths. -ed)