Teo

Teo is the leader of the Night Crow and one of the Legendary Old Four Lords. He was succeeded by Ace.

Backstory
Young Teo came from Moonlight Isle to Asgar with his father. The Isle was in chaos and wars continue to happen due to conflicts from cruel leaders who fight to expand their territory. In order to restore peace, Teo worked with Ace's grandfather and Orly to settle the war. Unfortunately during the war, Ace's grandfather was killed by the enemy. This deeply angered Teo, who then immediately came to the enemy's stronghold alone, killing every single person in one night that his name became a legend. Under Ace's father, the Moonlight Isle was united. Teo who was still grieving, retired from the war and returned to the main continent of Aisha. Years later, Teo came back to Moonlight Isle to teach Ace, but he was disappointed by Ace's lack of skills. He then left again and found the Stairway to Heaven, and rebuilt it as the headquarters of Night Crow together with Orly.

They recruited members into the Night Crow to help prevent the world's destruction. One of the member is Carl Heron, the older brother of Eileen, who joined after he was defeated by Teo. Carl admired Teo's powers and vowed to follow him.

Season 2
Teo saved Evan, who was defeated by Spike after trying to rescue Karin. Teo defeated Spike, and the defeat caused Spike to feel humiliated and hold a grudge against Teo. After that, Teo took Evan as his disciple. Under Teo's tutelage, Evan became stronger. Evan reunited with Yuri and formed the group of "White Wolf", it became an alliance to the Night Crow.

After Teo had deemed Evan strong enough, he told Evan that he is finally ready. They bid their farewell as Evan prepared to go after the Dark Knights.

Trivia

 * Teo is a half elf. His father is an elf and his mother a human.
 * Teo is 70 years old.
 * According to Seven Knights tumblr, he is 177 cm tall and weighs 67 kilograms.
 * Orly has a crush on Teo. However it is unclear how Teo responds to this.
 * Teo's father was killed by Gellius, who is Spike's father.
 * The only person who can fight on par with Teo is Kyle. They once fought for 3 days and 3 nights, that left a scar on both their faces. Kyle wishes to fight Teo again someday to test their strength.
 * Spike and Giparang held grudges after being defeated by Teo. In the event before Spike's awakening release, Teo and Carl's icons were shown to be frozen.