Kaisar used to be a knight from a prestigious family, but has since become a bounty hunter. He chases Favaro, blaming him for his current status.

Kaisar is a very tall man, with white pants, a green shirt with white stripes and golden buttons, and a dark green vest hung over it, with green arm covers and golden stripes on the wrists. He has his knight's sword sheathed in a navy blue scabbard on his left side at all times. At times he's seen in gray knight's armor; even when he takes the armor off he keeps the leggins of the armor on his legs. Can be often seen holding a knight's pose and usually bears himself with knightly demeanor.

He is a righteous man with a very strong sense of honor, and constantly follows his own ideal of justice. Kaisar is shown to be very empathetic and compassionate, as seen during his meeting with Rita. Because of his tragic past as a rebellious son who was distant from his family, Kaisar now highly values family and abhors other people who take their family for granted. Seems to have a crush on Amira, calling her a beauty on their first encounter.

Mistarcia is a magical world where humans, gods, and demons mingle together. In the past, the black-and-silver winged Bahamut has threatened to destroy the land, but humans, gods, and demons overcame their differences to fight together and seal its power. The key to that seal was split in two, one half given to the gods and the other to demons, so that they would never be united and Bahamut never released. Now, two thousand years later, the world is in an era of peace—until the day a human woman steals the gods' half of the key.



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10 years after the event, humans at the royal capital gather wealth, the demons are enslaved to assist with the capital's revival, and the gods lose their power due to a decrease in religious piety. The world is thrown off balance as humans, gods, and demons hold their own ideas of justice.
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(Source: Anime News Network)

Shingeki no Bahamut: Genesis - Short Story is set after the events of season 1. 

The first short story focuses on Favaro and Kaiser between the events of the first and second series.

The second short story focuses on Kaiser and Jeanne between the events of the first and second series.

This manga follows the lives of Favaro Leone and Kaisar Lidfard between the events of Shingeki no Bahamut: Genesis and Shingeki no Bahamut: Virgin Soul.