Blodhgarm
Blödhgarm was a male elf spellcaster, who had the ability to alter his appearance according to his perception of beauty. During the war against Galbatorix, he was in charge of a group of twelve elven spellcasters from the capital city of Du Weldenvarden, Ellesméra. They served as Eragon and Saphira's personal bodyguards. Several of these elves, including Blödhgarm, chose to join Eragon as he and Saphira left Alagaësia to care for the Eldunarí and dragon eggs.
Appearance
Blödhgarm had the fangs of a wolf, the pelt of a forest cat, as well as the eyes of an eagle. He had blue fur, which some women found beautiful. He also had a musk-like scent that attracted only females. His name in The Ancient Language means "Blood Wolf." He once declared to Nasuada that someday, if his perception of beauty were to change, he might turn himself into a creature of the sea and swim away.
Family
Blödhgarm was the son of Ildrid the Beautiful. He is also said to have a cousin named Liotha, who also had a wolf-like appearance. Not much else was known about his family.
Abilities
He was an extremely talented elven spellcaster, being the leader of a group of eleven other elven spellweavers. He is shown to be faster than all of these eleven in the long chamber in Galbatorix's palace and can be assumed to be stronger than them. His physical appearance did not lend him any additional abilities.
Role in the Varden
He was assigned by Islanzadí to support Eragon and Saphira, along with the eleven other spellweavers. They helped Eragon battle Murtagh and Thorn by combining strength. Blödhgarm and the other elves acted as Eragon's assistants in almost every conflict he faced after being sent by Islanzadí.
The twelve spellweavers were loyal to Islanzadí, who supported the Varden. Blödhgarm survived the assault on Urû'baen. After the war, Blödhgarm and his surviving magicians were charged with protecting the Eldunarí and trying to heal the minds of those who had been enslaved to Galbatorix. When Eragon and Saphira decided to leave Alagaësia with the Eldunarí and the dragon eggs, Blödgharm and his spellcasters accompanied them.
History
Together, the twelve were powerful enough to withstand three of the Forsworn simultaneously, albeit with a friendly dragon in the air supporting them.
Scent
Blödhgarm himself had a musk surrounding him that attracts females, which could be an attempt to find a companion or simply an unanticipated side-effect. Nasuada and Elva could counter the musk by concentrating on the taste of horehound, which was apparently extremely acrid in flavor, based on the memories of Nasuada from her time in Farthen Dûr. It seemed his smell had no effect on Arya. Soon after Blödhgarm arrived, Trianna placed a ward on Nasuada that protects her without her having to concentrate on horehound. Men were entirely unable to detect this odor. When Saphira pointed it out to Eragon, he noticed nothing. Saphira had to share it with him mentally in order for him to experience it.