Bladix

Bladix is a sword which feeds on blood and possesses people forcing them to battle until the death.

Appereances
Bladix look like a purple colored sword with a gem in his guard which is actually its eye. When Bladix take full control of itself can pull some other arts which it can use like weapon for attack or legs for escape.

Personality
Baldix is obsessed for blood and don't care of his user which consider like a property.

Plot
Bladix appears from the chapter 31 to chapter 33 of To Love-Ru Darkness (adapted in the episode 8 and 9 of the To LOVE-Ru Darkness 2nd).

Initially, Zastin mention Bladix as the cursed sword which had sucked blood in several battlefields during the Galactic War. It was known to infect its weilder's mind with madness turning them into a murderous beast with a thirst for blood. Unbeknownst to all, Bladix is brought to Earth (from Nemesis) ending in the hands of Tenjōin Ryūga who sent it to Tenjōin's mansion to put it in his collection.

Later, Rin take the the sword and she gets possessed. Rin then start to attack Rito and Momo which (together with Nana, Yami, and Mea) are substituting the unhealthy house-servants. Thankfully, Yami intervene and save them. Yami and Mea then explain Bladix' real nature; it is not a cursed sword, but trully an intelligent metal parasite created 2000 years ago for the Galactic War. Mea warn that if they destroy Bladix while its sincronized with Rin' mind, the girl will never regain consciouness.

So, Rito use Mea's Psycho Dive power to enter in Rin's mind where he face Bladix. Despite the sword attempt to take control of him too, Rito gives him a speech and free Rin's consciousness. Bladix try to take control of Mea, but gets scared from Nemesis who is inside her. In the real world, Bladix moves away from Rin and tries to escape, but it is defeated from Yami.

Trivia

 * Bladix is voiced by Taishi Murata.