Ottar is tall and heavily muscular Boaz with rust-colored hair and eyes along with a pair of boar ears. He wears a dark blue sleeveless top with a red pectoral part with a collar like part, grey pants, and brown and gray shoes.
Ottar is extremely loyal to Freya and will follow her orders. He is shown to not feel any jealousy toward Freya's interest in Bell and does not allow anyone to insult Freya, becoming enraged if anyone does so. Despite being a member of the Freya Familia, he has been shown to help others, such as when he used an elixir on Mikoto after she used an Ignis Fatuus.
Ottar believes the opposite of Eina, believing that adventurers would never break out their shell if they didn't adventure. He is also one of the few adventurers who are still active that has clashed with the Zeus and Hera Familias. His personality is greatly influenced by his experiences facing them.
When Ottar was a child, he was abandoned without even having known his own name. Freya found him dying in an alley somewhere and told him he was beautiful and took him into her Familia. She also gave him his name at this time. Due to her material support and emotional warmth, Freya would become everything to Ottar.
Two years after joining her Familia, Ottar would become Level 2. Around this time, Mia joined the Freya Familia at the request of Freya in order to train Ottar.
Ottar clashed a few times with the Zeus and Hera Familias before they were defeated by the One Eyed Black Dragon and were forced out of Orario. Each time ended in him being defeated.
At some point in the past, Ottar half-killed a Balor, the Monster Rex of the 49th floor. Later, after learning about Ais defeating Udaeus by herself, he also defeated Udaeus by himself while managing to obtain the Udaeus' sword.
He reached Level 6 fifteen years before his battle with Udaeus and Level 7 seven years before the same battle.
Incredible Power: Ottar possesses physical strength capable of overpowering huge monsters and high-level adventures with minimal efforts, such as when he cut a Grand Treant Demi Spirit's fire magic in half and easily overwhelmed the Demi Spirit itself.
Concurrent Chanting (並行詠唱): A high-level technique involving casting magic while fighting or moving around. Its difficulty is likened to dealing with a bomb with both hands while fighting due to the chance of failing a chant or not being able to control their own magic power.
Hildis Vini (ヒルディス・ヴィーニ): While its specific effects have not been revealed, it has been shown to be a powerful magic, having been able to destroy Udaeus' arm and half of its face. It is a short chant magic.
Vana Arganture (
Stortus Ottar (
Hunter (狩人): Hunter improves Ottar's abilities against monsters he's fought before and gained excelia from.
Abnormal Resistance (耐異常): Abnormal Resistance negates the effect of abnormalities such as poison.
Magic Resistance (魔防)
Strong Body (剛身)
Healing Power (治力): Ottar can only use Healing Power through his skill, Stortus Ottar, when he continues to fight. The condition for the skill is in proportion to his status.
Spirit Healing (精癒): Ottar can only use Spirit Healing through his skill, Stortus Ottar, when he continues to fight. The condition for the skill is in proportion to his status. Spirit Healing automatically begins regenerating Ottar's mind at a low rate after using magic. It is a rare ability, with Riveria and Ais being the only adventurers so far that actually have it.
Supreme Black Sword (覇黒の剣): The sword is an order made weapon by the Goibniu Familia that costs 410,000,000 valis. It was created from the Udaeus' Black Sword drop. The Goibniu Familia high smiths turned the drop item into an ingot and reforged it into a greatsword.
Weapon: In addition to his main weapon, Ottar wields a great axe and a great hammer.
- Ottar is based on Ottar the Simple who was a protégé of Freya in Norse mythology.
- Ottar is one of the only two Level 7s in the world.
- Ottar's magic Hildis Vini is based on Hildisvíni, Freya's boar who was actually Ottar in disguise.