Plue

Nikora, or more commonly Plue, is a Celestial Spirit that has no obvious combat abilities and seems to be merely a comical character for his summoner Lucy Heartfilia. The character is pretty much the same from Hiro's previous work Groove Adventure Rave a.k.a Rave Master. He communicates through interpretive dance.

Appearance
Plue is a short, stout white creature (who is commonly referred to as a dog by Lucy Heartfilia) with bland eyes and a golden horn-like nose. He cannot speak besides saying Plue. However he mostly communicates by using gestures and motions. Lucy thinks he's cute.

Personality
Plue is relatively the same as he was in Rave Master. He loves sweets. He can only be summoned on Tuesdays, Wednesdays and Thursdays when Lucy makes her contract with him. He serves as a cute pet for Lucy more that a combat spirit.

Magic and Abilities
Plue doesn't have any particular abilities, merely acting as a pet to Lucy.

Synopsis
Nikora's role in the story is much like a pet for Lucy. However, he was used to demonstrate how contracts are made to Natsu Dragneel. He also seemed to recognize Loke, during the Loke arc, which was possibly meant forshadow Loke's revelation as a Stellar Spirit, or it may have meant nothing.

Trivia

 * Apparently, it was his idea for Natsu to make a team.
 * Nikora is the one dog Happy likes.
 * In chapter 71 Happy plays a trick on Lucy by feigning a voice for Plue. Happy makes a reference to Rave Master.
 * Plue was also shown in Monster Soul.
 * Mirajane believes that Plue is the strongest among all of the celestial spirits.