Krom Dragongaze
A Wolf Lord of the Space Wolves. His Great Company is called the Drakeslayers. Krom is a short-tempered, rebellious, and frequently violent individual whose discipline and self-control are apalling even by Space Wolf standards. That said, he believes in rewarding success and repaying favors, and channels his pathological need to prove his badassery into protecting the people of the Imperium. He also has a quality nearly unheard of in the 41st Millennium: he makes a genuine effort to learn from and atone for his mistakes.
Krom also one of the few Space Wolves to deviate of the usual wolfing to the wolf degree, with a dragon theme for himself and his company.
Comorragh Holiday
While looking for the missing Logan Grimnar, Krom was captured by Dark Eldar. He fought in the arenas of Comorragh, managing to kill a Talos while his armor was unpowered and he had no weapon, not to mention that he was drugged out of his mind by the pesky xenos. He wound up working with a couple Dark Angels to escape.
Alaric Prime
Long story short, Krom felt sidelined and decided to hunt down Grukk Face-Rippa with only a small task force of Drakeslayers. This was a complete disaster. He didn't kill the warboss, but got his own ass kicked. Naturally, Logan Grimnar called him out on his stupidity. Later on in the battle, Krom led the Imperial forces, but only after most of the fighting was done. This embarrassed the shit out of Krom, and highlighted his unreliability.
Wrath of Magnus
While mostly in the background during this one, Krom did volunteer for inglorious guard duty as part of atoning for the above-mentioned mess. He also managed to help out the Grey Knights and contributed to proving the loyalty of the Wolves.
Tabletop
He's mostly a bog-standard Wolf Lord with a Master-Crafted Frost Axe (with build-in Shred USR). He does have a few tricks up his sleeve, like re-rolling failed saves near objectives and giving all Wolves in his Greatpack Furious Charge. He is rather squishly (3+ save, no EW etc.), but can stand his ground against majority of the characters (if they dont have str 8 or more).