Thorgrim stands a fine example of Fenrisian flesh, even before his transformation into one of Russ' kin. While he has a broad face, the womanfolk of his village had said his features were most pleasing to the eye. Not that such things matter for one of the Wolves of Space, but prior to many of the scars he received in service of his Chapter, sniggers were thrown his way during his Aspirant training. These days, he looks as many of his Brothers do, fierce with a body of iron thews to back up this menace. While his eyes have yet yellow to the sheen of wolf-eyes, Thorgrim is a young Space Wolf yet, and his fangs have not yet grown to the length of the grey-beards or Wolf Lords. Still, compared to most Space Marines they would be of extreme length. One oddity that separates Thorgrim from other Space Wolves is his insistence on keeping the tattoos of his people upon his arms. Many Space Wolves remove traces from their old lives upon joining Russ' Chosen, but Thorgrim insists it is a mark of his past worth remembering. Not only does it link him to his time as a mortal, but it keeps fresh all of the hunting lessons imparted by his grandfather.

Unlike most of his fellows, Thorgrim eschews his ancient Power Armor whenever possible. As a Wolf Scout, he forgoes the protection of heavy ceramite for the security of the shadows. His Scout armor may be pitted with battle damage, but he keeps his gear in good order. As with all Vlka Fenryka, Thorgrim is festooned with charms, fetishes, and other works of Fenris. Some are merely to ward off evil and harm. Others are remembrances for fallen Pack mates. But the most precious of all are the tokens of glory bestowed upon him by the Great Wolf himself. These he takes great pride in, and will fight fiercely against anyone who derides them, or attempts to damage them. Even among the esteemed ranks of the Deathwatch, everyone knows it is not wise to anger a Space Wolf.

Beyond the typical and well-practiced air of barbarism cultivated by the Sons of Fenris, Thorgrim harbors a keen mind that would shock some of the more dismissive and arrogant Chapters out there. Highly perceptive, and always looking for weaknesses in his enemies, it can be said that his mind is more like a predator than a warrior. But then when the time comes to draw blades, the man can fight like a man possessed, and the skill and savagery of the Berserker can be seen in his every violent movement. If anything, that simple contradiction can sum up the great warrior. A steel trap mind with a taciturn silence that conceals a whirlwind of roaring violence just under the surface. This attitude may be unconscious, but it serves a noble purpose. Nothing is more important to Thorgrim than his oaths and service to the Great Wolf, and he would do anything to see Logan's will carried out. While he finds no shame in taking pride in his own accomplishments, he ultimately wants to see his deeds reflect on the Chapter. For Thorgrim sees himself as but one small part of the Saga of the Vlka Fenryka. His wish to leave the Chapter in a better state than when he joined is all that truly matters to him, in the end. And woe unto anyone who tries to stand in his way. That is perhaps why he hates the forces of Chaos more than any other foe. The alien is but a creature of its nature. Deadly, unknowable, and contemptible yes, but the Traitor Marines are Oathbreakers. To break an Oath, is to be without honor, and in Thorgrim's mind, honor is all that separates Mankind from the vile darkness they fight against.

Far from the simple savage he appears, Thorgrim is a complicated man, and it would do well his allies and foes not to underestimate him.

Thorgrim Nightwolf was born Thorgrim Agnarsson of the Vanfarinn. When he was still a teenager, his village went to war with a rival tribe, the Hjǫrr, and despite initial victory, clever political maneuvering by their rivals saw the Vanfarinn beset by other tribes on different fronts. Knowing they could not stand in all battlefronts, the tribe dissolved. Despite his youth, Thorgrim joined in nighttime raids of their enemies, along with other blood-sworn warriors who would die before surrender. He finally fell in combat with the Hjǫrr sentry who had killed his brother Sjorn. Because of his tenacity and fighting skill, the mortally wounded youth was selected by an observing Wolf Priest to join the ranks of the Space Marines, and his life was saved by the medicine of the Astartes.

Thorgrim was sent to one of the training camps on Fenris, and was eventually sent through the Gates of Morkai, in which he was subjected to psychic interrogation, searching for any hint of taint. His stubbornness and ability to hold a grudge was almost his undoing, but he did not give in to the wolf spirit and was allowed to drink from the Cup of Wulfen. At the end of his initiation rite he returned to the Chapter's fortress of The Fang long before his fellow initiates, his knowledge of the wilds and tracking were so impressive.

However, despite his ascension to the ranks of the Vlka Fenryka, not all tasks given are glorious or song-worthy. Indeed, long stretches of mundane life can take place between moments of valor and victory. It was during one such time that Thorgrim earned renown among his Brothers, and earned his moniker. Having been assigned the simple task of patrolling the wilds of Asaheim, to make sure there was no hidden threat to the Fang as was their eternal duty, Thorgrim did not expect much. Perhaps a fight with a Troll or two, but nothing worth reporting. To his great surprise however, after weeks of trekking through the frozen land and upon reaching its shores, he found desolation. A coastal outpost of training Aspirants had been laid to waste by an unknown force.

Investigating the destruction, Thorgrim held off reporting in the incident until he could discover more. That was a foolish mistake, as the source of the slaughter, an ancient Sea-Dragon, reared itself from the water and took a swipe at the young Space Wolf. Though he managed to avoid a swift death with a desperate dive, the move knocked his vox-bead from his ear, cutting off communication with the rest of the Chapter. After scrambling to safety, the warrior examined the beast to find that the source of its rage and pain was a wicked harpoon sticking from one of its eyes. One of the seafaring mortal tribes must have stuck the monster with a poisoned weapon, driving and already fearsome creature insane. Even as he watched, the Sea-Dragoon made his way up the mouth of the great river, obviously only just beginning it's rampage. Several more Aspirant training camps lay between the Wyrm and the deadly guns of the Fang. Thousands would die if this beast was not stopped. But without contact to the Fang, Thorgrim was on his own.

For the next two days, he stalked the enraged beast, hampering it at every opportunity. He ran out of Bolt-shells on his first day of fighting the beast, for though the weapon was powerful, the beast was so large as to make the wounds non-lethal. Still, by nipping at its heels like an insidious Wolf, he was able to delay the creature greatly. While the Sea-Dragon licked its wounds, Thorgrim would run ahead and warn the training villages in its path. Still, despite his successes, the monster would not stop its rampage. Even using his few grenades only seemed to infuriate the monster further. So, in an act of cunning, Thorgrim led the beast into a narrow branch of the great river, between two high bluffs. Using his last grenade to cause the jagged stone to come tumbling down on the Wyrm, he caused grievous wounds to the thing. This was no juvenile Drake however, and the thing still lived, even if it was greatly weakened. Taking out his combat knife, Thorgrim actually lept upon the grotesque creature and engaged it in combat. Dodging deadly, if sluggish, blows from the beast, the swift hunter drove his weapon into the remaining eye of the Dragon. Backed by his altered body, and servo-motors, the strike was more powerful than the cast of the tribesman who had stuck its other eye. The knife reached the brain of the Wyrm, killing it. Though in its death-throes, it dashed Thorgrim into the rocks, damaging his armor, and rending his flesh severely. Still, the stubborn Wolf dragged himself from the water, and pulled many a black fang from the maw of the Sea-Dragon, as trophies for his victory. Then, weeks later, he stumbled back to the Fang. After recovering upon a med-alter, he was offered a heroes feast for saving the future warriors of the Chapter, and even the gratitude of the Great Wolf Logan Grimnar.

It was the High King of Fenris who bestowed the name Nightwolf upon Thorgrim, and bade him join the ranks of the Grey Hunters in recognition of his service. Despite the fury that freshly promoted Redclaws often display, Thorgrim was always more controlled in his approaches to war. In spite of the savagery of the Canis Helix, Thorgrim always seemed to fall back on the guerrilla tactics of his mortal youth, and although the Space Wolves usually waited for Grey Hunter packs to fall to casualties before they recruited survivors into the Wolf Scouts, his skill was such, and his demeanor lent itself to this decision, he was asked to join the Wolf Scouts, in the service of the Great Wolf's Company. These were but the first steps on Thorgrim's path to glory. It has been over a century since the death of the mighty Dragon, and his elevation out of the Blood Claws. The deeds and glories heaped upon his name can not be easily counted, and even among his Brothers. Thorgrim has shown ability and bravery beyond his years. It was no surprise to the Great Company when Logan Grimnar declared the Nightwolf to be his choice for the Deathwatch, when the call came forth from that shadowy organization. For his part, Thorgrim sees this as a great honor, and beyond that, a sacred duty. For he was ordered to go by the Great Wolf, and Thorgrim sees the fulfillment of every command as honoring his Oaths. With the weaponry and tactics of the Deathwatch are at his disposal, Thorgrim has the opportunity to increase his already deadly repertoire. Which he will take, with a great and savage joy.