>>53657387>Which for many Dark types take the form of ruthlessness and aggressive natureBut that's not the ONLY trait that matters. Plenty of dark types also show traits that they're mischievous/deceitful (Murkrow, Thievul, Zorua) or isolated (Absol, Tyrannitar, Sableye, Darkrai).
Dark types seems to have multiple characteristics without needing to show off all of them at once. They can be cruel, but they also just be misunderstood. Like at Absol. It's kind and shows up to warn people of incoming disasters, but because of that, people misunderstood and thought it was the cause of said disasters so it was shunned and stayed away from others. All it's dex entries say it's introverted by staying in the mountains and doesnt like fighting, but despite that, it's one of the few pure dark type in the entire series.