Answer
(Fatwa: 394/D=31/K=1433)
(1) The qualities of the girl you wrote above are preferential according to Islam. Next being the girl an orphan increases the virtues of this nikah provided this proposal is finalized to please Allah. It is mentioned in hadith:
من تزوج لله توجه الله تاج الملك رواه ابوداؤد (مشكوة 375) قال العلى القارى فى المرقاة المفاتيح مَنْ تَزَوَّجَ لِلَّهِ بِأَنْ يَنْزِل عَنْ دَرَجَته فَيَتَزَوَّج مَنْ هِيَ أَدْنَى مَرْتَبَة مِنْهُ كيتيمه حقيرة او مسكينه فقيرة صالحة اِبْتِغَاء لِمَرْضَاةِ الله أَوْ أَرَادَ بِالتَّزَوُّجِ صِيَانَة دِينه وَحِفْظ نَسْله الذى هو مقتفي حكمة ربه توجه الله آه هذا كِنَايَة عَنْ إِجْلَاله وَتَوْقِيره أَوْ أُعْطِيَ تَاجًا وَمَمْلَكَة فِي الْجَنَّة . (مرقاة برحاشيه مشكوة).
What are the reasons behind disapproval of your parents? It is needless to reject it merely on the basis of distrust. Yes, if the girl has something against dignity then it may be considered, but it is not appropriate to pay attention towards the talks about her family and others. If you make your parents agree then it is far better.
(2) Though it is not necessary for an adult boy to take permission from his parents and a nikah done without their permission shall be valid but it is better for a son that he takes any decision after making his parents agree; because it carries more blessings.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband