Could they have used a more ghetto name?
it may be something called way different here.
In fact there's no Dana O'shee being existing. in Celtic/Welsh/whatevs Myth i can find these 'fairy-like' beings
The Sidhe (pronouced Shee (She-e) which are commonly known as what the Tuatha turned to after being forced underground by the Millasians
The Leannanshee or Leannan-Sidhe which are a second tribe of the normal Sidhe and have the same origin both of those are Manipulative FAIRIES.
Then there's the Leanashees which are OFTEN mistaken for the Leannanshees but are a different Tribe described as Devils/Demons or simply a 'Fairy Like tribe of Succubi' They're as manipulative as the Leannansidhe and the Sidhe but they're born that way and have no Tuatha Heritage.
Now the next is unknown if it's true as i can only find ONE instance of them being mentioned:
The Dianshee's, a Tribe of Small Demons with Batlike Wings and Horns that are mistaken to be Sidhe's but are actually what has become of the surviving FIR BOLG.
It's very likely devCat has just looked for a cool new pet and mixed up the Dianshee's with the Sidhe/Leannanshee's so the pet's description features the name Dana O'shee (which is most similiar to Dianshee) and what the Sidhe and Leannanshee's are.
Well i want it and i'll call it after my Dianshee/Leanashee OC XD