Like I said in the title, this is my first attempt at making a challenge. So, if it doesn't work out too well, please be patient. To get the most enjoyment out of this, I recommend having at least these expansions: University (zombies), Nightlife (vampires), Pets (werewolves), Apartment Life (Witches/Warlocks). Plantsims, Servos and others aren't exactly necessary, but they add interest and color.

Challenge Name:"How did I get on the set of a Horror Film?" (Or the 'life with real monsters' challenge)

Goal:To fulfill the lifetime want of one human self-sim, while living in a household and town of non-human sims.

Details:This is more geared for those who do not play 'supernatural' sims, to get them to explore that area of gameplay, or for those who like those kinds of sims. Your sim is the only human (save for NPCs you see or randomly-generated townies) in town. You will be controlling only your sim, so don't get too attached to any other sims you make! But you do need to make other sims, though. And here is why.

Instructions:Step One~ Pick up this lovely, versatile painting and these wonderful new neighbors! They are not both mandatory, but I would advise getting the painting at the very least. Otherwise, this is going to be hard to do.
Step Two~ Create a blank town. Yes, I know, not fun. But if you made custom shops and houses in other neighborhoods, or have some downloaded, this makes things easier.
Step Three~ Populate your town. Make some families in CAS; old people, young people, families with kids, families with pets, does not matter. Then, one by one, put them in houses. Long and tedious, I know. Give them the basics (beds, a toilet, shower, stove, fridge, ect.) and then, go to paintings, give them the Sim Transformer painting, and modify the family as you see fit. Repeat with all families you make and place in town.
Step Four~ Make your self-sim. PLEASE make this sim an adult. Young adult is doable too, but you're obviously going to need non-human classmates (other sims in other dorms), instead of neighbors. Give your family one sim for every expansion pack creature you have, except for bigfoot or servo. Name them how you like, dress them how you like, but for aspirations, personality, and turn-ons and turn-off, just click randomly. Don't put too much thought into this. You won't be playing with them again, except for after the challenge. If you feel like.
Step Five~ Move your sims into the neighborhood, and get the painting. Modify all the sims, EXCEPT your self-sim! If you are like me, and have all the base-game expansions, except for things like teen style stuff, or IKEA stuff, you would have, aside from yourself, one witch/warlock, one alien, one werewolf, one vampire, one plantsim, and one zombie. Again, Servos are optional. The painting can spawn them IF you have Open For Business, so go ahead and throw one in if you want.
Step Six~ This is the official start of the challenge, once everyone BUT your sim has been modified into their proper species.
::Optional:: Step Seven~ If you have not yet lost, and your sim is going to become an elder on this sim day, or is one day away from becoming an elder, save the game, and pause. THIS IS THE ONLY TIME YOU MAY LOOK AT THE OTHER HOUSEHOLD MEMBERS.
If any of them have a want (such as the vampire has a "(your sim name here) becomes a vampire") and is at least best friends with your sim, fulfill that want. This is an automatic 'win' for the challenge.

Rules: -Your self sim must remain human at all times.
-Your self sim can be any aspiration, any fitness, any hair style, have any personality, but you may not use custom skintones unless they are normal human colors!
-Your self sim does not have to really be you. It is just an in-game sim you find pleasing enough to care about.
-You are not allowed to have werewolf, vampire, zombie, servo, plantsim, or witchiness as a turn-on OR a turn-off.
-You may not intentionally interact with human NPCs and townies, unless it is an autonomous interaction (in other words, if humans drop by to visit, ok, but no calling them up and inviting them over!)
-You are allowed to get a job, go to work, get married, have kids, anything. In fact, it's encouraged.
-You can not, at any time, click on the non-human sims in the house and control them! No cheating!
-If you are building a house from scratch, you may only have one bed per sim, one room per bed, and one full bathroom (shower/tub, sink, toilet, catbox?) for every three sims on the lot.
-Pets are allowed.
-Items that boost/lower the mood of all sims on the lot are NOT allowed. Age modifiers are NOT allowed. You must play with the Aging enabled.
-You can use Motherlode when building only, and only twice. The rest of the time, you can use kaching, but only five times, and only when first building and furnishing the house. After that, no cheats.

You 'Win' if: -Your sim ages to Elder or dies of old age without having a mental breakdown (total aspiration failure, psychologist/doctor appears for them).
-Your sim successfully marries and has a child* with (family aspiration) or maintains a long-term relationship(lasts at least three sim weeks), and stays friends with (romance aspiration) one of the non-human sims in your household. (*not required)
-Your sim maintains at least one BFF relationship with one nonhuman household member, or three* Best Friend relationships with three* nonhuman household members. (*or whatever the maximum number of nonhuman sims is that you have in the house.)
-Your sim is made into a non-human sim by a member of the household. (See Step Seven for more information)
-Your sim achieves their lifetime goal and then dies of old age, or is made into a nonhuman (see Step Seven)

You 'Lose' if: -Your sim dies from; fright, drowning, fire, electrocution, hail, disease, flies, a satellite, or any other method besides old age.
-Your sim has a mental breakdown at any point in their life.
-Your sim makes an enemy of any of the non-human sims in the household (Makes them furious, bad relationship score, ect).
-Your sim dies and is revived as a zombie.
-Your sim dies and is revived via the 'phone' (can't remember the name of the item. It is a career reward.)
-You become a zombie, vampire, witch/warlock, plantsim, werewolf, or other supernatural creature via a cheat, or your own carelessness (not paying attention to what your sim is doing with other sims)
-Your sim dies of old age without having married/had a good relationship with one of the nonhumans on the lot.

I guess that is everything. Let me know how it works for you; I am going to do the challenge myself, too.

I'll try, as soon as my Sims 2 downloads are sorted out. (Will take a time)

Only the grand vampires can autonomously bite, though. A normal vampire can have wants to bite a sim, or to see a sim be a vampire, but they don't do it unless directed or influenced by someone else. And it's only knowledge sims that have wants to bite others. Anybody else just wants to be cured.

That's not true. I have Nina Caliente as a vampire in my game and she has plenty of biting wants. Though yes, she still wants to be cured.