Alright, let's see...
What about at Gringotts? Nifflers LOVE gold. Working at a place with that much gold would be their dream job. Buuuut, what if a niffler accompanies a goblin INTO the bank? (Hint, hint, disaster)
An investigator, perhaps? Most of these crimes are gold-related, so a niffler could sniff 'em out as easy as pie!
(That was a pun, by the way.)
Nifflers are animals (Well, duh!), so Care of Magical Creatures is always a possibility. But, honestly, nifflers are the mischievous and fun kind, just like charms!
Plus, a niffler with a wand in a hat would look totally adorable!
Now we come to the most important part - sorting. We're going to temporarily take over the job of the Sorting Hat, minus the song and stuff. (Unless you WANT me to! Shoo! Go to the comments and tell me what you think!)
First off, let's look at its most standing-out traits. Nifflers are really cute, have an eye for shiny things, and playful. They're also affectionate, but they CAN wreak havoc.
AND they can also sometimes take a bite out of people's legs, if you now what I'm talking about ;)
This sounds a bit like Hufflepuffs, doesn't it? Playful, fun, affectionate, but dangerous when they're provoked.
So, there it is, folks! *shouts* HUFFLEPUFF!
This is a tough one. I'd say either Pisces or Sagittarius. Let's take a look at both of them.
Pisces are compassionate, artistic, deeply emotional, especially empathic, at least a little bit psychic, and often inclined to throw themselves into caring for others at all costs.
Sagittarians are optimistic, lovers of freedom, hilarious, fair-minded, honest and intellectual. They are spontaneous and fun, usually with a lot of friends, and are perhaps the best conversationalists in the zodiac.
Hmm...a niffler's personality seems to it better with Sagittarius, so Sagittarius it is!