Porlyusica

Porlyusica is a lonely old healer living in a forest outside of Magnolia town. She is withdrawn and reclusive because she doesn't like humans, suggesting she is not one herself.

Phantom Lord arc
When Makarov gets injured after the Phantom Lord Guild battle by Aria, the guild members take him to Porlyusica to be healed. She appears to be an old friend of his. However, she chases Alzak Cornell and Bisca Mulan out after they drop him off. She says that Makarov's magical energy is floating around the air and can't be retrieved, though Mystogan recovers it later through his own wind magic and Makarov recovered faster. She scolds Makarov for fighting at his age and Mystogan for leaving an apple core on the ground.

Fighting Festival arc
Porlyusica appears at the guild amidst the fighting, asking where Makarov is. After Levy McGarden informs her, she completely ignores Levy and heads straight toward Makarov. With just a glance at him, she asks Levy to bring Laxus Dreyar there, stating that he doesn't have long to live. She later leaves Magnolia Town having healed Makarov. Before leaving she overheard that people thought Laxus would be the next Fairy Tail master but she silently scoffs at the idea.

Trivia

 * At one point, Porlyuscia had a prophcey that when Fairy Tail would gain three Dragon Slayers, something will happen.
 * Fact that she is well aquainted with Makarov and seems to know Rob, a Fairy Tail member, she could have been close associate, or even a member, of Fairy Tail