Don’t judge people’s personalities by their appearance like you’d judge a book by its cover.
A person's pattern is the pattern of actions which they take to become who they are. What do they usually do? What is their pattern? This is the same as their personal character or personality.
The readings are both kun'yomi readings, combined. For 人 you'll just have to remember this. With 柄 that's the reading you learned anyways, so that makes things easier. Just keep it consistent!