Intelligence vs. Wisdom
Intelligence (Int) is considered book smarts while Wisdom (Wis) is considered street smarts.
A character with high Int learns quickly from books, knows a lot of facts and analyzes information quickly. Book knowledge skills are based on Int.
Wis is based on common sense and comes from experience and focus on the surroundings of a character.
I first learned how to role play them from Intelligence versus Wisdom.
Int gives options to overcome a problem, Wis makes a character question if the problem should be solved and what the consequences are.
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A character with low Int will see few options when faced with a problem.
When faced with a trap, a low Int character will just try to go around the trap or smash it.
In battle, the same attack is often used over and over again as the character doesn't know that much about his opponents.
Low Int characters have limited knowledge of magic, cosmology, history or religion as all of these are learned by reading books.
Characters with low Wis will never wonder why a trap was set in the first place or if it should be disabled at all. They won't question whether it's the best option to attack in a situation and what the consequences are if they do.
They will not wonder why the merchant is so generous with her deal and will not have the experience to look at hiding spots when entering a dangerous room.
Low Charisma (Cha) characters can be played as a shy, withdrawn people.
They can also be played as someone who says rude things or is annoying, crossing a socially acceptable line. Ugliness is also a possibility, or smelling bad.
So low Cha characters will possibly insult someone when trying to be diplomatic or comical when trying to be intimidating.
A lie will be seen right through.
So what are the dump stats of your favorite D&D characters?
Do you have additional means of role playing low mental stats?