Collector

"One down, five to go."

- The Collector after receiving the Aether

Taneleer Tivan, also known as the Collector, is one of the Elders of the Universe.

Biography
Taneleer Tivan is the last of an ancient, forgotten race, thereby making him an Elder of the Universe. Due to his obsession to collect different objects and specimens, Tivan was given the title "Collector"; he controls a massive intergalactic trove containing a vast collection of both objects and living specimens.

In 2013, two Asgardians, Sif and Volstagg, arrived at Tivan's museum, bringing with them the Infinity Stone known as the Aether, which had been recovered by Thor after his battle against Malekith on Earth. They gave it to him believing that it would be safe from other parties. They also thought  it wouldn't be wise to keep it on Asgard since another stone, the Tesseract, was already on there, and Sif and Volstagg left the Aether in Tivan's care. After the two left, Tivan remarked to his assistant, Carina, that they now had one of the stones in their possession, and only needed five more, hinting that Tivan was already seeking the Infinity Stones, in particular, the Orb.

In order to obtain it, Tivan hired Gamora, the Zehoberi assassin and adopted daughter of Thanos.

Relationships

 * Thanos - Enemy turned ally
 * Carina - Subordinate
 * Ronan the Accuser - Ally
 * Nebula - Ally
 * Guardians of the Galaxy - Enemies
 * Star-Lord - Enemy
 * Drax the Destroyer - Enemy
 * Groot - Enemy
 * Rocket Raccoon - Enemy
 * Gamora - Enemy

Trivia

 * The Collector is the oldest living character to appear in the Marvel Cinematic Universe, being significantly older than Odin, likely being even older than Malekith.