Masaail pertaining to the Wali and Compatibility between spouses

Girl getting married to a boy that is not her kufu

Q: If a girl is adamant in marrying a boy who is of no match to her nor does the boy conforms to the girls Kufu; the girl observes her daily prays regularly and wears hijaab while the boy is known to be involved in drugs and alcohol,and the girls parents do not approve nor consent to the marriage at all.

Question#1: Based upon the above situation if the girl was to have her Nikkah done privately without her parent’s approval and her parents did not grant their consent to the Nikkah, will this Nikkah be rendered valid?

Question#2: Based upon the above situation if the Nikkah was rendered vaild, are the parents then correct in their own right to consider dissolving or annulling the Nikkah?

Question#3: Based upon the above situation if dissolution or annulment of Nikkah is not available or not appropriate will it then be acceptable and suitable for the parents to suggest and encourage their daughter to seek for a Talaaq (Khula)

Wali in nikaah

Q: I just wanted to know if you have no wali can you do nikaah? I have nobody but I want to do nikaah. His parents are not agreeing. Also we are both adults and want to get married can you help please?

Rejecting a proposal

Q: Is it wrong Islamically to reject a marriage proposal because the guy has a disability. Alhamdulilah he is a good guy but he has a speech disability wherein he stutters a lot. Sometimes it's difficult to understand what's he is saying.

Nikaah without a wali

Q: I made nikah with my husband. He is a Maliki . I do not folow any madhab. The imam who made a nikah implemented it without a wali according to the hanafi madhab. After I found out that there are sahih hadiths proving that there is no nikah without a wali. Also most of the madhabs don't accept the nikah without a wali. Please help me to clear the situation, should we make a new nikah or this one is valid?

Obeying one's parents

Q: I like this boy and he likes me.We are ready to get married however my parents disapprove because we are of different casts. I do not want to go
against my parents but are they allowed to do this according to Islam? They have not met him  or his family. What is the best way to deal with the
situation and what can I read?