Byronic's ideas weren't numbered, so I'll call them 65 and 66.
Here are quirks from my current character:
67) Will not discuss anything of importance with anyone who isn't a trusted ally -- and trust is
very_ hard to gain. He also has #2: Incredibly paranoid.

68) Does not understand the concept of names. He'll call people by their titles, and give his own if they ask his name. When someone introduces himself by a name, he assumes it's a title or description. "My name's Bob." "What does bob mean?" or "Today, I met a bob. I can not yet distinguish it from an ordinary male human, but I'm sure I will learn more in time."
69) Does not understand the local system of exchange. Why, my character wonders, is a vial of ink worth eight times its weight in gold, while a knife is worth a small fraction of its weight in gold? You could take this to any extreme. Maybe the character always forgets how many silver coins exchange for a gold, or which metal is more valuable.
70) Has no sympathy for children, especially when they cry. "That boy is years old. He should be taking care of his own problems, not crying to his parents."
71) Looks down on single-class characters, especially single-class wizards, thinking them overspecialized and unable to take care of themselves in complex situations (he's a wizard/monk).
72) Extremely judgemental.
73) Overconfident.
And some from my last character:
74) Will not kill anything intelligent, even in self-defence. He'll always run from battle if it's a choice between killing and running.
75) Does not tolerate the use of enchantment magic, even when used against enemies. If he was going to kill someone dispite #74, it would be because that person tried to take away someone's free will.
And some new ideas:
76) Doesn't trust his memory, so he compulsively writes things down. In the middle of a conversation, he'll pull out a sheet of parchment and jot down some notes.
77) Very low self-esteem. The slightest hint that the person he's talking to doesn't like him will send him doubting what he's saying, stumbling over his words, and feeling terrible.
78) Is easily brought to tears, but tries to hide it. There will be some specific types of things that bring him to tears, such as someone doubting his ability to do something, or someone questioning his religious practices.