These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Bilingual Bonus: "Noodnic" is Hebrew for "Bothersome Person". Many words in the various dark tongues in the books are also Hebrew words, although they're usually rather random ("Naar" is "Young Man"). And the "-im" suffix being used to describe a plurality of entities is also from Hebrew. Unfortunate Implications?
Alyss, the Canon Immigrant demigoddess with the attitude and appearance of a rebellious punk teenage girl. She originally appeared in the novel series, wherein many fourth walls were broken, but was then seen near the end of the Grand Master series, saving Lone Wolf at least once and then setting up the plot for the final book by snatching the Moonstone from under Naar's nose.
Firestone. Despite being given maybe three mentions throughout the Grand Master books, he is implied to be Number Two to Lone Wolf himself, in charge of leading the Monastery and keeping things running while Lone Wolf is on his adventures. Many fans like to think that he is the Grandmaster having his own missions in the New Order series.
Evil Is Cool: Most of the good guy nations are your standard high fantasy kingdoms, while a lot more imagination was put into the evil hordes and nasty places.
In Book 18, Lone Wolf notices a crowd gathered around a faith healer. The angry mob is ready to attack him for having no progress in fixing a woman's headache. When Lone Wolf realizes that the man has no powers, but genuinely wants to help people, he discretely uses his own powers to cure the woman, turning the old man into a hero for his village.
Another one from Book 18. After defeating the Ghost of Roark haunting the ruined and deserted town of Amory, Lone Wolf wakes up in the morning to sunshine and birdsong, and his spirits are lifted when he realizes that life is already returning to the place.
Gary Stu: Lone Wolf is this, and it's EXTREMELY obnoxious to female readers.
Italians Love Lone Wolf: The series is almost universally popular among Italian tabletop gamers, where the Kai Knights have been redubbed "Ramas Knights" and a few names have been changed around to emphasize the "medieval fantasy" feel of the setting.
Nightmare Fuel: Many, many, many creatures of Magnamund (or the Daziarn, or the Plane of Darkness...) are absolutely nightmarish in appearance. Their descriptions are short but vivid, with nice details added (like how much they inspire revulsion to Lone Wolf) and with plenty quality illustrations, mostly from the protagonist's viewpoint (that is, more often than not, when the monster is about to gut you). And you get plenty of Red Shirts or Mauve Shirts' disturbing deaths, just to demonstrate how nasty those critters are.
The Helghast◊ and Crypt Spawns, although already quite horrific, are hardly the worst of the lot.
The Cener Druids in particular are dedicated to producing Nightmare Fuel. The Forest of Ruel is full of nasty things, and they're nothing compared to what's in the fortress of Mogaruith.
The Rahkos from Book 7, a brain-eating, undead severed hand, is largely believed to cause the most Squick-inducing death...
A searing pain explodes behind your eyes as the hand clamps itself to your head. As the decaying fingers pierce your scalp, forcing their way through your skull, your vision turns red and your body shakes uncontrollably. The hideous claw burrows deeper, feeding on the only source of nourishment that can sustain its existence: living human brain. Your life and your quest end here.
Zakhan Kimah and his Orb of Death (though he's a skippable fight if you successfully throw the Dagger of Vashna at him, but you don't get the option to do so if you have the Sommerswerd).
Far from the only example; as mentioned in the main article, this is the tradeoff if Lone Wolf brings the Sommerswerd with him on his quests. There is at least one enemy that's nigh impossible to beat without the Sommerswerd that can't be avoided though: the Deathlord Ixiataaga.
The Chaos-Master in book 11 is another infamous example where the Sommerswerd makes life much, much more difficult for you.
The Kleasa from the World of Lone Wolf series. It is by far the most powerful enemy Grey Star ever actually fights in the series and boasts High Combat Skill, Endurance, and the ability to drain Grey Star's Endurance and Willpower even if Grey Star magically shielded himself right before the fight. It's also one of the few enemies Grey Star can't avoid fighting no matter what. And it appears in the first book. Because of this, if you roll low on your starting scores it is extremely difficult to finish the book wihout rules abuse — that you can use the magic seed to do X9001 damage. Humorously, using the seed causes an instance of Script Breaking. Project Aon suggests "fixing" this bug, leaving you a bit screwed.
"The sight [of Lone Wolf] is so frightening that all resistance melts away, and creatures hurl themselves into the lake rather than face the fearsome straight-backed, white-skinned killer of their kin."
Book 7 was definitely one of the worst, probably due to it taking place in the fantasy counterpart of Africa. It doesn't help that all the slaves in the castle are dark-skinned. (Although, to be fair, the ones enslaving them were explicitly the bad guys.) Except that those slaves are not human (they are consistently described as "creatures", much like the Beastmen guards of that place). And to be even more fair, the people who were enslaving them were also black-skinned as well, like basically everyone in that part of the world.
Book 5 (set in a fantasy-counterpart Arab country) suffers from this too, though to a lesser extent. There are good Vassagonian characters depicted, and it's implied that at least some of the problems are caused by the puppet government put in place by the Darklords.
More generally: untrustworthy characters are frequently "swarthy".
The Woobie: Tavig, a character Lone Wolf may encounter in Book 7. He's just some poor guy who took on the mission of invading Castle Death to pay for his sister's ransom. After being thrown into The Maze twice, all he wants is to escape. Why is he a woobie? Let's just say that if the hero meets him, he'll only get a quick death if Lone Wolf kills him. Otherwise he'll either be torn apart by dog men or slowly crushed to death by a giant fist. Yeah, Castle Death's a fun place.
I was so dismayed by his death that, 15 years later after having originally read book number 7 I included a non-playing-charachter patterned after him in a D&D campaign of mine only to more or less force the players to rescue that long-lost sister of him.
It gets worse. The Updated Re-release has a bonus adventure where you take control of Tavig early in his jaunt into Kazan-Oud. He kills some nasty bad guys, thwarts a plot by Zahda to escape the island, and saves a damsel in distress, and as they reach their escape, he sets her loose and goes back into the castle to his inevitable fate. Poor guy.