1826 pets
Father Winter's Helper
Binds when used
Use: Teaches you how to summon this companion.
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Want it | 
Neutral
Emotes "no" and exclaims in protest when summoned outside of the Winter Veil holiday.
Snow sound (on summon)
Green Helper Box
Item Level 1
Binds when used
Use: Right Click to summon and dismiss your helper. Requires a Snowball to summon.
This is one of four BoU Winter Veil pets that drops at random from the [Gaily Wrapped Present]. You must be level 20+ to loot this item. This item appears under the Winter Veil tree in Ironforge (alliance) or Orgrimmar (horde) on and after December 25th through January 1st, but the [Green Helper Box] can often be found at auction year-round.
As of Patch 4.3, the Father Winter's Helper no longer requires a snowball to summon. This companion is also very vocal about being summoned outside of the Winter Veil holiday, and will not remain by the player's side during the off season.
During the Feast of Winter Veil, this companion will summon and ride their very own miniature reindeer when players mount up on a ground mount.
Vs. 
Mechanical
Vs. 
Critter
Flying
50% from Undead abilities
33% from Critter abilities
These off-season allies work tirelessly to prepare for the Feast of Winter Veil, and would appreciate not being disturbed the rest of the year.
Use a pet leash on one of these guys, and it looks so sad.
I used a low level of this awesome pet to do in those pesky poor to uncommon Tiny Harvesters found when trying to farm a rare one. It's a real time saver. I got irritated with the prolonged "back to life" aspect of mech battle. With the Winter Helper, the kill is faster, and becomes almost fun. Not a rare? 1. Launch the ice tomb. 2. Cast Blizzard. 3. Throw a snowball. This generally does the Harvester in. ZZZzzzap! Harvester comes back to life. 4. Ice Tomb falls from the sky, killing it permanently. 5. Next!
Even with mid-road stats(276 power and speed) Winter's Helper has some great tools. Excellent synergy with Call Blizzard with Ice Lance, very nice match with Tiny Snowman or Kun-Lai Runt. Both Ice Tomb and Gift of Winter's Veil both hit hard, and unless you opponent can avoide Ice Tomb will also stun. Having elemental attacks makes this humanoid dangerous to mechanicals. Quite nice pet that can be powerful in the right environment.
I apparently have a LOT of transgendered bpets. Apparently, this is a female. o.O
I encountered a glitch with this pet earlier today. A person in Pet Battles Polymorphed this into a frog with a frog's ability, and it was turned into a completely white frog. When the polymorph effect ended, it turned into a blank white model DIFFERENT from the Father Winter's Helper Model. I have a screenshot right here. http://fc04.deviantart.net/fs71/i/2012/347/7/f/a_bug_in_pet_battles__world_of_warcraft__by_drybones0-d5nxdnu.jpg
This pet is really a very powerful battle pet. I have found it works extremly well paired with the abilities of the snowman and the reindeer companions as well as other pets that benefit from Chilled.
Also, if you do buy them, try to do it when there's an abundance on the AH. Come July-August, these pets can fetch as much as 10k+, depending on your server.