Culcis of the Royal Volpone. Mainly due to him assisting the Ghosts in defending his wounded comrades (despite being wounded himself) as well as not engaging in the petty discrimination that the rest of the Volpones did. Him successfully pushing back a vicious assault in Necropolis, losing a hand in the process, did nothing to hurt his popularity.
The Chaos cult known as the Blood Pact has gotten some attention for being far more competent and organized than the standard crazed fanatics that Chaos followers are usually depicted as. They even have a fan-made codex for 9th edition.
Fan Nickname: Liijah Cuu is, quite accurately, referred to as Teamkill McBackstab von FethingBastard.
Hilarious in Hindsight: In the beginning of the second book, Gaunt asks Caffran about his fiance, who died on Tanith, and tells him he's sorry for his loss. Caffran sneers and asks if Gaunt is going to give him some platitude about how there's other fish in the sea, and Gaunt sarcastically obliges, telling Caffran that on one of the battlefields he's going to face, he'll find the love of his life. Funny thing is, Caffran actually did meet Tona, the love of his life, on the battlefields of Vervunhive.
Lijah "That Damn Bastard" Cuu crosses it when he rapes and murders a civilian woman in The Guns of Tanith.
There's also Meryn's pension fraud racket, taking advantage of dead Ghosts and relatives for financial gain. Plus leaving Costin to die in order to keep him quiet, not to mention a few other Ghosts who hadn't even been involved in the scam.
Tear Jerker: Bragg and Caffran's deaths are probably the hardest hitting.