if it's on the pc, here's your answer;
Scroll over the lifetime wish, & it will say what you need to do to accomplish your lifetime wish. Same with wishes or promises.
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In between opportunities and needs click lifetime happiness, then click lifetime rewards, you will eventually find change lifetime wish, it will cost 10,000 lifetime happiness points which isn't a lot, then it will let you chose any lifetime wish you want, hope i helped :)
When you have lots life points you can purchase presents . one of them is to change your lifetime wish . [its icon is a mam who is thinking . Hope I help . . .
To become a monster in the game Bon Voyage Sims 2 you need University. With University you can become a zombie.
To fulfill hugh, simply achieve a gold+hard mode of the ghost minigame and hook him up with johnny
(If you have Sims 2 Nightlife) Call the math-maker and ask for potion...lycanthropy. Hope this works ;)