I don’t know about your campaigns, but I think I’ve literally gone my entire Dungeons and Dragons–playing life so far without ever once either using (as a dungeon master) or encountering (as a player) a gnoll. So I’m coming at the final monster in my initial series on humanoids with fresh eyes.
Gnolls are described in the Monster Manual as rapacious raiders, scavengers and nomads with hyena-like heads. They have high Strength and low Intelligence; their behavior is driven by their violent and destructive instincts. Like many other humanoid D&D monsters, they have darkvision. They wield spears and longbows, according to the MM, and they have one distinguishing feature, Rampage, which allows them to move half their speed and make a bonus bite attack after reducing a foe to 0 hp in melee.
Honestly, I’d dispense with the longbow—it doesn’t make sense in the context of what else the MM says about gnolls. Their Strength is high enough that they gain little advantage from using one. They aren’t smart enough to craft one or social enough to barter for one. According to the flavor text, gnolls prefer to strike at easy targets; longbows are designed to puncture armor. And gnolls’ single unique feature is melee-oriented.
So my vision of the gnoll is strictly a hand-to-hand fighter. As creatures with high Strength, high-average Dexterity, average Constitution and a respectable five hit dice, gnolls are shock troops. When they spot a vulnerable target, most likely during a nighttime patrol (darkvision provides advantage against PCs who don’t have it), they strike at once. Despite the premise of this blog—that monsters don’t just go “Rrrraaaahhhh, stab stab stab” all the time—this is exactly what gnolls do. They’re fearless and aggressive, using their full movement speed to approach their targets, then Attacking (action) with spears; if one such attack reduces an enemy to 0 hp, the gnoll Rampages toward another enemy within 15 feet and bites it (bonus action).