Trinity Raven

Trinity Raven or Special Raiding Squadron of Assassins were a trio of warrior from the Assassin's Guild, Death's Head Caucus. Prior to Fairy Tail's storyline, they fought during the Cabria war and were said to have assassinated every ranked officer under the Western's army's command. They were hired by Jellal, and fought against the Fairy Tail members in the battle at the Tower of Heaven in the Tower of Heaven arc. The group was defeated by the members of Fairy Tail.

Strangely, the three members seemed to be merged into one body, or something similar, as Vidaldus appeared earlier, without the eye markings and instead being calm; Jellal then asks him to do 'that' and Vidaldus appears to cast some spell of some sort; the next moment all three members are standing in front of Jellal.

Trivia

 * The idea of the Trinity Raven was actually inputted at the last second by Hiro Mashima. Initially, he wanted the people to interfere with Team Natsu to be Simon and Co. However, as he drew their past as slave children, Hiro began to felt sorry for them to the point that even if Team Natsu managed to defeat them, it wouldn't solve their conflicts of the past.
 * All three members of the Trinity Raven's names are based off different birds in Japanese.
 * Ikaruga - a Japanese Grosbeak
 * Fukuro - an Owl
 * Vidaldus Taka - Taka means Hawk