We talk about character as if is were a tangible thing, yet when we try to describe it, it eludes us.
Not at all. Your Character is the person you play when you pretend to be a magician, and its MORE tangible than your personality, because its made up of choices that you make consciously. You can make a list of every facet of your character, but most of us couldnt explain how our personalities were developed.
You cant really do magic, so when you pretend to, you are, as Robert-Houdin famously said: an actor playing the part of a magician.
Your character is more or less developed by the amount of time and effort you put into developing him. It begins simply by asking questions like why do I choose to show them this aspect of magic (how you choose your tricks), or what does it mean that I can do this (what are they supposed to think about it).
For Martin A. Nash (the M.A.N) it is the Charming Cheat. For Juan Tamariz well, hell I dont know what to call his character, but he is clearly one of the most developed characters in magic. And then theres Max Maven (aka The Thief of Thoughts)
Thats why most who offer advise on developing a character say to play an exaggerated version of yourself. Dont try and be suave if youre not. Its easier to act like a variation of you than to be a whole different person.
You might, for example, make a decision that you got your ability to read minds after you were abducted by aliens, but that you wont tell people that because you dont want to be labeled crazy. You scripts and your choice of material will be directed by that knowledge. Even if the audience never knows why you make the choices you do, your act will be better for it because you
will know why and it will give shape and nuance to everything you do and say.
Of course, that's just my opinion, and I've been wrong before...