In your opinion, what characteristics and/or properties constitute a "good tsundere"?
If the character is Makise Kurisu, then she is a good tsundere.
So THIS is where this pic comes from!
>tsun for logical reason other than "has to hide her feeeelings"
>gradual, natural transition between the tsun to the dere
>drops the tsun entirely at the end of the series
>not physically violent
Just have other modes asides from tsun and dere, allow her to be playful, dorky, scaredy and just don't turn her into a bitch undeserving of the MC