Xeno is an extremely interesting character . As the books suggest he is probably very Luna -like . the publisher of the quibbler would have to be odd , right ?
Xeno seems to love his daughter a lot . he was willing to let his enemies get to harry just to save his own daughter. maybe he felt she is the only thing left for him after his wive's death.
this brings up a very intaresting point. his wife .
there can be two sides to the argument ,
one - > she was exactly his opposite and was attracted to him for certain queer reasons (opposites attract , and anyway , who knows who you might fall in love with, after all? ) and a marriage needs a twist to it , to prevent it from following a monotonous routine.
two - > she and Xeno were quite similar and married because of their perfect understanding of each other . after all, who can live with a person who thinks very differently from you for years on an end ??
how much ever i may try, both these ideas appeal to me equally , so i can't say which is more likely .