A glossary of the Gaelic (Scottish and Irish) that Shirley uses along with the deities she invokes/mentions.
Breithniú - analysis
Claochlaigh - transform
Seachmall - illusion
Scáth - shade/protection
Cosaint - safeguard
Truailligh - contaminate
Gnáthaigh - haunt
Tairngreacht - prophecy
Dobrón - grief
Orbis Alia - Otherworld
Tuatha Dé Danann - Peoples of the Goddess Danu
Eochaid Ollathair - All-Father. Also known as The Dagda
Nuada Airgetlám - Nuada of the Silver Hand (or Silver Arm)
Brigid - 'Exalted One'. Also known as Brigit or Brighid. Daughter of the Dagda and one of the Tuatha Dé Danann.
The second most important deity that applies to Shirley is The Morrígan who is a Celtic death Goddess (sometimes a triplicate Goddess) who is associated with sovereignty, prophecy, war, and death on the battlefield. As far as Shirley is concerned, The Morrígan is the Goddess she is ultimately tied to concerning her powers and her status as a banshee. The Morrígan in some stories is revealed to be the very first banshee.
Her main deities though are the Tuatha Dé Danann (as she is considered to be descended from them as a banshee as banshee comes from bean sídhe meaning woman of the fairy mounds) and The Dagda. It was The Dagda who led the Tuatha Dé Danann underground to the fairy mounds and she most commonly invokes their names the way others would say 'God' or 'Jesus'.
Pictures of markings + locations (please note that all markings are in silver and very hard to see unless you know what and where to look for. Those with canon heightened sight - including Eagle Vision - can spot them more easily than others. All markings are silver)
Crow - corresponds to Claochlaigh. Located on her left shoulder.
Eye - corresponds to Breithniú. Located on the nape of her neck.
Dragonfly - corresponds to Seachmall. Located on her right shoulder.
Pentragram - correpsonds to Scáth. Located on her right wrist.
Horse shoe pointing up - corresponds to Cosaint. Located on her left wrist.
Evil eye - corresponds to Truailligh. Located on her right index finger.
Skull - corresponds to Gnáthaigh. Located on her right foot.
Rod of Asclepius - corresponds to Breithniú: scanadh míochaine. Located on her left forearm
Typical clothing (all skirts/dresses are worn with black tights)
Shirley:
Cedric (twin brother)
Lachlan (father)
Iona (mother)
Blair Lawson (boyfriend figure)
Fionn McAlvennie (maternal grandfather)
Elspeth McAlvennie (maternal grandmother; deceased)
Cassandra Verity (Cedric's girlfriend, closest female friend)
Shirley's bone knife