Few people ask me about this quest. It's a little complicated, so I decide to write this guide. I don't know if I'm allowed, but anyway. Let's get started.
Find Santa Paws at northeast of Christmas Village, he will ask to find Santa Paws Impersonator.
Find Santa Paws Impersonator (xmas_dun01 131 137), he will ask for 300 Raccoon Dolls (You can get it from Gift Box or farming)
Talk to Santa Paws again, he will ask to help his 4 Helpers at Xmas Village.
First Helper is at northwest, near to a house. He will ask for 1 Spirit of Christmas (16668) and 1 Santa's List (16667)
Second Helper is near to respawn point, on the left on the roof.
He will ask for:
100 Orange Juice,
100 Earthworm the Dude,
100 Bitter Herb,
100 Sweet Candy Cane (only available at Pet Warehouse),
100 Tropical Banana,
100 Rainbow Carrot,
100 Sweet Milk.
You can buy all those items at Pet Warehouse, although this require a lot of zeny and someone who completed Pet Warehouse quest.
Third Helper is on the east, on the roof. He will ask for 20 Christmas Gift Box (From this Mini-Quest, you will need 5k of Wrapping Lacer and 5k of Wrapping Paper).
Last Helper is at southeast. He will ask for 400 Coals.
Now back to Santa Paws, he will ask you to talk again to Santa Paws Impersonator (xmas_dun01).
Santa Paws Impersonator will ask for 200 Sweet Potato.
Now you are done, talk back to Santa Paws and Legendary Santa Paws Helper Hood will be yours :)
Hope it helps. I'm not sure if the items are 100% correct, since I can't talk again to the npcs again.
Happy Holidays guys.