Then I apologize for not being clear: I was not intending to make a general assertion about "what defines character" for everyone. I was trying to assert what I feel defines a character as a person for me. I entirely agree that my idiosyncratic perspective on what defines a character is "not inherent to RPGing", and was not trying to suggest otherwise.I read your post as making some assertions:
There is an assertion about what defines character, namely, what the character feels and how they react. As I said in my first response, I'm setting possible quibbles with this to one side.
There is also an assertion that some process of deciding what the character feels or how they react other than player authorship is a re-defining of the character. This move from defining to re-defining seems to make sense only if one accepts as a premise that the player is the one who gets to define the character, by way of authorship, such that any other injection of feelings or actions to the character is not a contribution to the character's definition but rather a re-definition.
And my post was making the point that such a premise is not inherent to RPGing as such.
An additional (or perhaps) alternative way of making sense of the reference to re-defining is to equate any change in the character with a redefinition of the character. And my post also drew the contrast between D&D and other RPGs in respect of the importance placed on character change or character consistency.
In the context of the thread, it seemed to me potentially useful to bring out those premises and make them - and also departures from them - explicit.
As a favor, I would ask that in the future when quoting me you not omit phrases such as "in my opinion". Although in this case my use of that phrase was evidently not enough to avoid the implication that I was making a general assertion, by omitting that phrase from your quote you still changed the meaning of my post.