
I try to expand on the character more.
I'll pitch moral dilemmas or such and try to work out the character's reaction. I'll likely do this multiple times with multiple situations. Once I feel that an area of them has been sufficiently fleshed out, I try to brainstorm a plot, encounter, or dialogue that would lead my character to discuss or display the expanded traits or beliefs.
If the problem is more deep-seated in that you don't like the character concept, try to gradually shift it. Even if you continue to dislike the concept, if you're attached enough to the character to not discard them then you may be able to find a middle-ground where you're comfortable with playing their present personality.
I'll pitch moral dilemmas or such and try to work out the character's reaction. I'll likely do this multiple times with multiple situations. Once I feel that an area of them has been sufficiently fleshed out, I try to brainstorm a plot, encounter, or dialogue that would lead my character to discuss or display the expanded traits or beliefs.
If the problem is more deep-seated in that you don't like the character concept, try to gradually shift it. Even if you continue to dislike the concept, if you're attached enough to the character to not discard them then you may be able to find a middle-ground where you're comfortable with playing their present personality.