|Photo Credit by Vitrals|
Irene has shown to be very knowledgeable, showcasing herself as a historian when revisiting a folktale of her birthplace, seemingly enjoying the counterbalance of a "wonderful story" of the two angels of Zonia. She's shown to have a humorous side to her, as seen when she wanted to see Juliet and Heine do battle, only to later say it was a joke. In regards to her underlings, she is very attached to them, even referencing them as her "children", coming to their defense after their battle against Mirajane Strauss, painfully torturing the latter as collateral for defeating them.
Irene is extremely confident in her own power, wanting to take care of Acnologia by herself (even talking of humanity's greatest threat without any timidity in her words) nevertheless as her very own comrades, among them being August, noted that they could not defeat the Black Dragon without Fairy Heart at their disposal Due to this, her confidence not only spreads within her, but to the might of her Empire, saying that she could put aside the Majesty's "war game" due to the task of handling Acnologia, stating Alvarez (with her Majesty at the helm) would be victorious regardless of the outcome.
She also displays signs of being a cruel individual, such as when she questioned Toma E. Fiore's love for his daughter, Hisui, after personally transforming her into a mouse. When displeased at his caring words for his child, she makes a muted expression on her face before moving to attack them, showcasing her dislike for things not apropos to how she conceives it to be. When she started to torture Mirajane, she devilishly promised her that not only would she not have a swift death, but after it is all said and done, she would turn her into a a lump of rotting meat, showing more of her evil and brutal nature.
When serious, she has shown to criticize and be honestly blunt to those even above her, such as the Emperor, for the latter treating the war as a game and also inviting naivety in his heart in regards to his former lover, wanting to be the one to correct him through it all. Besides all of this, she is very respectful and complimentary to those higher than her, still delivering high praise to the same Emperor who she claimed if he participated in the war against Ishgar that it would be over sooner after it began, while taking honor from the Black Dragon's compliments after engaging in battle with him, returning the favor by saying the rumors of his power don't do him any justice in person. However, she can be somewhat vain to go along with her sly mouth, remembering that society has dubbed her the "Scarlet Despair", wishing for the title to be something "cuter" than her current alias.
At some point in her past, Irene crossed over from Ishgar to Alakitasia to join the Empire and to follow Zeref, for reasons yet unknown. Some time later, Irene was taught the art of Magic and enchanting from the Black Wizard himself, which she later went on to use her new power to enchant a white and a black sword that became Juliet and Heine respectively.
Enchantment (付加術 Fukajutsu): Irene has shown extremely high proficiency in the art of enchantment; so much that she's classified as a High Enchanter (高位付加術士ハイエンチャンター Hai Enchantā). It is implied by Acnologia that she learned this ability from Zeref himself, giving her the ability to change and alter landscapes, climates, and the terra firma of the world, as well as manipulate the atmosphere, people, and objects "enchanting" them into any forms on however way she desires. It's been noted by Zeref that she's prodigious when it comes to attaching and detaching Magic from objects, as seen when she offers to detach Fairy Heart from Mavis, something which should normally be impossible. However, due to Fairy Heart's complex nature, this task proves time consuming and delicate for even Irene.