Phineas is a 'troblin' (half-troll, half-goblin) who roams the woods outside of Briarwood in the magical realm, rejected by humans and spirits. He first appeared saving Clare from the Hydra Worm and later met Nick, whose friend he became. It was Phineas who told Nick that Necrolai and Koragg serve an even greater evil, Octomus, the Supreme Master of the Underworld. Phineas befriended the other Rangers when Nick and Catastros were trapped in another dimension and later helped all the Rangers on their quest for the Fire Heart, during which he displayed impressive acrobatic skills. In the episode Scaredy Cat, Phineas is taken to a human dentist so as to have his teeth attended. He was escorted by Toby, who believed that Phineas was "Xander's uncle from the Old Country". At the dentist's office, Phineas is revealed to have eighty-three teeth, of which not all are his. Phineas was later escorted to the Rock Porium by Toby, where became a fan of rock music after hearing it for the first time. Phineas is a little clumsy and has a dry sense of humor, but is quite cunning.
Whereas Phineas' origins and early history are not entirely known, he seems to have a strong connection with the Mystics and the Great Battle. He has told Clare that he was present during the war between the Mystics and the forces of the Underworld and personally witnessed Calindor's betrayal of Daggeron; later, in Ranger Down, Phineas admitted to Daggeron and Udonna that, during Daggeron and Calindor's battle, he took Udonna's baby Bowen to the human realm for safety.
In Dark Wish, Phineas found Koragg insensate after the latter was defeated by Fightoe and 50-Below. Phineas seemed to have a little respect for the dark knight, which he showed by attempting to give him a eulogy. He was about to take Koragg's Wolf Saber when the knight, revealed to be alive, woke and frightened him. Koragg, too injured to save himself, asked Phineas for help, to which the half-breed reluctantly agreed. When Imperious used Jenji to create a world wherein the Power Rangers did not exist, it created a new timeline wherein Koragg and Phineas were allies. Koragg was aware of the legend of the five Mystic Warriors, of which he told Phineas. When Koragg sent the Rangers to the dimension where the Tribunal of Magic could be found, he broke his alliance with Phineas, who seemed saddened to say goodbye to his "friend".
Later, after the Ten Terrors had revealed themselves to the surface world, it was Phineas who revealed to Nick that he was the being known as "The Light", the son of the mightiest Mystics, who had the potential to single-handedly vanquish evil. In The Hunter, just as Oculous was about to open fire on Nick, Phineas saved the Ranger from an oncoming bullet and convinced him to not give himself up, based on the premise that all life would be lost if the Light should fall.
In the episode "Light Source", Phineas met Leelee, with whose outcast status he sympathized. During their conversation, Leelee decided that she would rescue Udonna, who had been captured by Hekatoid; Phineas decided that he would tag along. On their way, they encountered Clare, who achieved common ground with Leelee and joined the rescue effort. The three of them infiltrated the cave where Udonna was held and freed her from Hekatoid's entrapments. Before they could free her, they were surrounded by foot soldiers; Phineas singlehandedly defeated these, revealing in its use his prodigious strength, which is implied to have been the cause of Leelee's infatuation with him. Because Udonna was in a catatonic state, the trio used the Snow Staff— stolen from the villains by Leelee— and a spell to reawaken her. At a gathering held after Hekatoid had been defeated, the three had become fast friends and rejoiced over the days' successes.
In The Return, he came to the Rock Porium with flowers for Leelee, whose sweetheart (according to her) he had become. The Rangers then gave Phineas a (possibly temporary) job at the store, which he lost when his strange appearance frightened customers. In the final battle, Phineas gathered together the denizens of Briarwood's neighboring forest, convincing them that humans were not their enemy and that the true threat, to humans and spirits alike, originated from the Master of the Underworld. The combined faith of the two populations re-created the Rangers' magic, which had been depleted, allowing the Rangers to overwhelm the Master. Phineas, among others, was later hired by the Rock Porium.
Phineas is portrayed by Kelson Henderson.
Read more about this topic: Allies In Power Rangers: Mystic Force