Vulcanus
About
Vulcanus is a kind-hearted person who often cares for other people and displays greediness when it comes to money. She and Valvatorez tend to argue alot, especially about money. Fenrich also often shows strong dislike towards Vulcanus, always calling her "thief angel". As a human nurse, Artina was pure-hearted, treating anyone regardless of whether they were friend or foe. She had no regrets for her actions and she held complete faith in her beliefs on treating her enemies.
As an angel, Vulcanus is seen at first as a greedy angel who did not care for others and only showed interest and dedication to money. This was made evident when she stole money from the Information Bureau in order to collect funds for Celestia, as well as her eagerness and having no qualms about leeching money off of those who needed it more. During the course of the story, however, she displays her kindness and caring for others, such as curing Fuka, Desco, Emizel and Fenrich of the A-Virus with her blood despite it being against Celestian Law. She also forms a friendship and gossip triangle with Fuka and Desco, often working with them to find out the secret between Valvatorez and Fenrich and even helping them collect money from the Mint. Artina has displayed feelings of affection towards Valvatorez, although she is not willing to admit it. She also displays a great amount of respect for Archangel Flonne, believing in her ideals and collecting money so that they could save the world. At most times, Artina address other people politely, such as calling Fuka "Miss Fuka" and Valvatorez as "Mr. Vampire".
The angel known as "Vulcanus" was originally Sister Artina, a human girl who died and became an angel. She met Valvatorez 400 years before the events of Disgaea 4, when Valvatorez was still feared as a Tyrant. Valvatorez had planned to drink her blood, but could not do it because Artina was not afraid of Valvatorez at all, which slighted his pride as a demon. Valvatorez thus made Artina a promise not to drink any human blood before he could frighten her. Shortly after, however, Artina died during a war in the human world, killed by her own side for healing the wounds of an enemy soldier. Because of Artina's pure heart, she became an angel in Celestia, and continued watching over the soldier, now calling himself Judge Nemo. She witnessed Nemo's fall into despair and madness but was unable to speak to him due to his lack of faith in God and the angels. She was eventually "discovered" by Flonne and sent to collect funds from the Netherworld.
(Source: Disgaea Wiki)