So for my newest character I wanted to play a Vigilante Warlock. For the Social aspect I was wanting to do a bookworm shy type of young girl and then when she switched to her Vigilante form (with help from the Morphic mask ability) she would emulate her favorite story book character. In this sense I'm using a character from magic the gathering known as Chandra.
Now to the real question, with a character that is shy and doesn't necessarily converse a lot with others due to this, what alignment would really work for her? I'm not exactly sure how alignments mesh with personalities, I do know that Chandra or my close rendition is a chaotic character.
Introversion is the sort of personality trait that doesn't really lend itself to any specific alignment--you can be shy as any alignment. What motivates your character? What des she want in the short term? Long term? What is she willing to do to get them?
Love the idea of a vigilante Chandra. } : D
Alignment should really only influence personality in terms of virtues and vices. Just take a look at the section on alignments in the core rulebook. A few examples of personality traits that might be imparted by a given alignment are listed there.
I would assume that shy people are more inclined to respect or follow authority, which would suggest a lawful character. but your characters alter ego definitely sounds chaotic, so you might be able to split the difference and just consider your character neutral on that access.
Really, the more I look at the alignment system, the more I dislike it. It's useful in a fantasy game where there are quantifiable absolutes of Good and Evil, but the moment the conversation gets more complicated than that, I usually end up abandoning it. We're here to slay dragons, rescue princesses and overthrow evil necromancers in their dark towers, not become mired in ethical and moral debate.