Canis Wolfborn
Canis Wolfborn, also known as Growlthroat, the Feral Knight,Fangrider, or even Dog Wolfborn, is a crazy fucker that rides a giant fucking wolf the size of a mastodon into battle. And is followed by a bunch of fucking Fenrisian Wolves that he can command. By barking at them...yeeeeaaaaah. He is a warrior of the Space Wolves Chapter.
Canis was said to have been raised by a she-wolf as a young boy when he sought shelter in the cave she was and after a while, grew up and hunted with his new family, wolf tendencies included. He was recruited into the Space Wolves after a Wolf Lord named Harald Deathwolf discovered and challenged him to a grueling duel, which Deathwolf eventually won. Rather than put him down, he was brought to The Fang and made into an Astartes. Doesn't this backstory sound vaguely familliar?
Many people consider him to be everything that's wrong with the 5th edition Space Wolves Codex (AKA: an unhealthy amount of Wolf EVERYWHERE, to the point where the Space Wolves sound more like space furries instead of werewolf vikings in SPEHSS). Other people consider him to be an absolute badass rivaling Ulrik the Slayer or even Bjorn himself. Make of that what you will.