Yakdoriga

Yakdoriga is a Demon that serves the Nine Demon Gates of Tartarus.

Appearance
Yakdoriga takes on a rather odd appearance, seemingly looking like a cross between a frog, an insect and an octopus.

Possessing a long, flexible body with slimy, splotched skin, Yakdoriga has numerous tentacle-like arms, each long and ending with a series of spines and what appear to be suction cups. The creature doesn't seem to possess any teeth; rather, its mouth is wide and gaping, with thick lips. Yakdoriga's eyes sit closely above its mouth, small and frog-like in appearance. Out of the top of its head, two grasshopper-like antennae protrude.

Tartarus arc
When Natsu Dragneel locates and infiltrates the Tartarus headquarters, Kyouka, in the middle of torturing Erza Scarlet for information on Jellal Fernandes, leaves to investigate the ruckus, calling forth Yakdoriga to watch the Fairy Tail Mage in her place. Descending from the roof into the prison, Yakdoriga moves to grab Erza with its tentacle-like arms, though quickly jumps back when Kyouka demands it not touch the redhead.

Magic and Abilities
Coalescence: Yakdoriga has shown the ability to be able to morph through walls to travel and appear in separate places, doing so to enter a Tartarus prison cell when called by slowly emerging and descending from the roof.

Electric Charge: Seemingly in the same way that an electric eel produces static shocks from its skin, Yakdoriga has shown the ability to release electric-like waves from the ends of its tentacles, doing so as it prepared to torture Erza Scarlet. In addition, when it was reprimanded, the creature instantly ceased creating the currents.