OK, I edited this for clarity, and I know it's long, but some of you really prefer specifics.
Please note that items for my pets or children are not necessary, nor expected at all. This is just if you feel like it. I myself have never added items for pets or children, that I can recall. Sorry to my past victims, if you would have liked that. I just didn't think of it.
I do have a mostly lazy cat who loves catnip and batting toys (doesn't like the jingle balls we bought), and a spry young Lab/Pit Bull mix dog who shreds plush toys in seconds flat, but is pretty good with other toys (except the cat's jingle toys). Probably neither are into costumes or clothing, and the cat already refuses to wear her collar. They're not picky about treats.
Allergies are not a concern for people or pets in our home.
My 14 yr old collects Pokemon stuff; he doesn't care if he already has it.
He likes scarier type Halloween things than the other two; scary books, zombies, House of the Dead, Silent Hill, also Plants Vs. Zombies, he plays those games pretty often. He won't wear shirts, hats, buttons, lanyards, etc. that have movie or game characters on them. He's missing out on ToTing now that he's too old, so I wind up buying him candy. He likes everything except the super-sour stuff like Warheads and Cry Babies. Regular sour, he likes. Crackers of any kind, cookies, pretzels, all good. He doesn't care if it looks like it's for little kids if it's consumable, haha. He definitely does not like raisins, though.
My 13 yr old is mentally and physically handicapped; he likes things that preschool kids like. He does not put small toys in his mouth. He likes squishy or bendy characters, picture books (likes to flip pages, doesn't like being read to), toys that twist and click (like puzzle sticks where you can mix one character's head with another's body, and another's feet, etc.), those clear globe-wand lights with the spinning LEDs in them, other types of hand held lights, things that pop up when you push a button or pull a lever or string, bath squirt toys. He loves cute or spooky Halloween characters ("scary" doesn't bother him, he laughed all the way through the Haunted Mansion ride at age 5), Spongebob, Peanuts, Mickey Mouse and friends, Winnie the Pooh and friends, Nightmare Before Christmas, and Scooby Doo. I buy him candy too, but he can't do Now and Laters, Mary Janes, thick salt water taffy, any type of hard candy, or gum at all. He likes soft chewy fruit candies, all chocolate candies; crackers of any kind, cookies, raisins, or pretzels. He doesn't like to ToT or dress up, he'd much rather stay home and watch his DVDs. He likes character plates and bowls, but he physically can't use sippy cups and can only use lidded cups with straws (he dumps contents out of cups without lids).
My 3 yr old is easy to find things for. He does not put toys, slime, Play-doh, etc. in his mouth. He likes everything that's cute or spooky; Casper, Peanuts, any Disney, Little People, books to look at or listen to, Play Doh, slime, dinosaurs, superheroes and villains, knights, dragons, all animals, spiders, insects (except roaches and maggots), monsters, vehicles, bath squirt toys, etc. He also loves those little cardboard house boxes that Dollar Tree has. Oh, and he's a jigsaw puzzle master. He can do 50 piece puzzles, even small pieces. For candy, we don't give him hard candies except Dum Dums or flat suckers (no jawbreakers, Jolly Ranchers, Brachs hard candies, full sized Tootsie Pops or Blow Pops--but mini Tootsie Pops are OK). He also does not chew gum yet, and doesn't like very sour things. Crackers of any kind, cookies, raisins, or pretzels are fine. He loves to dress up. He has a fireman hat and coat, pirate head-kerchief and sword, hard hat, safari hat, rainbow clown wig, Army camo hat and vest, dragon full body costume, top hat, Captain America mask and costume. If you have old costume pieces to be rid of, he wears size 4-5, he's tall (he doesn't mind if things are too big, either). I would like to try to make or find him a Casper costume this year, he's a huge fan of Casper right now. He likes character plates, bowls, and cups, and can use any type of cup, whether it has a lid or not.
VICTIMS: That means everyone! Do you have pets? I can't just say fur babies, because some of us may have birds and fish and snakes and spiders and such. Besides myself, I noticed a few other likes/dislikes lists contained this info. I'd love to see all lists stating if they had pets and what kind(s). Some reapers like to throw in a Halloween goodie for these special companions.