Alexandrine Himmelreich is a Durmstrang graduate who is
ready to give you a high five to the face, with a chair
better than you. An unknown half-sister of the Brandt family, she is the result of a short but salacious affair between Josef Brandt and a German model and singer, Marina Himmelreich, in Munich. Since Marina never bothered to hide Alexandrine's parentage, she's always felt that she's had names to live up to - when she met Elissa and Conrad Brandt, it seemed that things would be made less complicated if she did not reveal their relation.
For Elissa this seemed to work out, and coincidentally they eventually became as close as sisters. However, although in the beginning Alexandrine and Conrad were on good terms, things deteriorated as Alexandrine and Elissa grew closer and closer. He seemed to sour around her out of jealousy, and Alexandrine's feelings towards him changed likewise (not really). She might have crushed on him if he wasn't such an asshole, but now she couldn't care any less what he or anyone thinks of her. Actually, she'd have loved to dig the knife in and let him know that his pretty little face wasn't good enough for Josef Brandt, and if it wouldn't hurt Elissa too, she would have done it already.
One thing she's never admitted is that Josef continued to visit Marina and Alexandrine, and continued to do so when Alexandrine began her schooling at Durmstrang - she would typically cover it up as visiting a girlfriend of hers. If it was possible, she'd let Elissa know the truth about what she had been doing, but it stood that it would simply hurt them both. Her yearmate and roommate was her favourite person and her closest friend, especially when they entered the darker circles of the school. Elissa recognised the anger behind the smile, and that's what glued them together.
Blessed with pretty faces and the resultant chases by the boys and girls of Durmstrang alike, they could have had the pick of the litter, but Alexandrine chose not to play with the fools. Alexandrine, however, found she had an excellent talent for getting what she wanted, similarly to Josef, from both students and Professors. The three found themselves with influence among their peers, and Alexandrine hilariously got Prefect. She used it to keep her friends out of trouble - she's not even sorry for the amount of trouble she got Conrad in, or pretended to. It's not her fault he's an insufferable arschloch, is it? (Sometimes.)
Alexandrine shared the training with the Brandt siblings, and although it was passed off that Josef knew about her habits and cared for her as a close friend to Elissa, honestly he wanted his third child to have the same chances as his others. She graduated with Elissa and moved in with her
and Conrad, regrettably (not really)
and was going around with her
and him, regrettably
when they were cornered and offered a job, where she moved to England with her and Conrad. After Elissa and Alexandrine fought and the latter disappeared, Alexandrine has gone freelance with Harold Colombo
with some kind of alliance with Evrard "Ev" Glenfield
and his twin Mariet Glenfield