I understand that ist alright for
a Muslim male to marry a woman from the people of the book. But how about if a Muslim male
wants to marry a Qadiani girl, who's of a good character and personality?
Given that the Qadiani school of thought is a form of major Kufr (disbelief) which puts them beyond the pale of Islam [i.e., Qadianis are not Muslims see Question 4060], it is not permissible to marry this woman, because Allaah says (interpretation of the meaning):
They are not lawful (wives) for the disbelievers nor are the disbelievers lawful (husbands) for them [al-Mumtahinah 60:10]
And Allaah knows best.
