As far as I understand, a character certificate is not given under any specific legal provisions. It is basically at the discretion of the person giving such certificate who gives us certificate on the basis of his personal knowledge. In view of this, you can approach the concerned officer and it is up to him to take a call in this regard.
Moreover, it may also be pointed out that a person is supposed to be innocent until proven guilty. Pendency of a criminal trial does not mean that the person facing that trial is already guilty. However, depending upon the nature of the pending case, and also on the type of evidence available, others may draw their own subjective opinions.
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