Character development - how I create people

This is how I go about creating and developing my characters.
I start out with a basic layout:
Age: (this doesn't always work as ages can change throughout the story)
D.O.B: (I normally just have a month and day)
Natural hair colour:
Eye colour:
Parents: (include mother's maiden name)
Siblings: (include rough ages)
Pets:
Known Powers: (this for when the characters are magical folk)
Subjects: (if the character is still at school)
Profession: (if the character has a job)
Weapons of choice: (should my character ever end up in a fight)
Martial arts grade: (same as above or in case I want them to have some cool fighting moves up their sleeves)
Characteristics: (these range from 'bad liar' to things like 'hates disappointing people')
Querks: (any funny or interesting habits the character may have, like hates red foods or believes in ghosts)

This gives me a basic character profile and an idea of who this person is. I don't always fill it all in at once: sometimes I just start off with the basics like name and appearance and add the rest as and when it comes to me.

Sometimes I create the characters on whim and then add them into the story later. Other times, I start writing a scene and suddenly introduce this character that I've never even thought about before: I then go and write them a character profile in my little planning notebook, filling in everything I've included in the scene with them and then add the rest (then or later on).
My main characters are, obviously, ones I thought about before writing them. However, I originally started my story with just one main protagonist in mind, but as I continued I reaslised I wanted somebody else to express a different point of view and have different ways of doing and thinking about things: someone who was more than just a sidekick or secondary character. I then developed this new character to have her own plot within the book and to have equal importance to my original main chracter.
So now I have two protagonists whose stories I can weave together and two separate points of view that I can write from: this lets me choose what I feel like writing, as the two are very different people and have their own distictive moods and atmospheres.

Well, that's my character development for you.
Hope this was helpful
Bye
W-O xx