Which of the novels I've read are worth recommending?

I once read a novel. I don't remember the title, but I can roughly remember the plot. It's the background of swords and magic. The male protagonist's father is a human and his mother is a dragon.(It seems that she is the eldest daughter of the Dragon Clan. She eloped. When her mother left, she stole the Dragon Clan's treasure. It was a gun. Finally, she signed a contract with the male protagonist.) The protagonist met a girl. She was of the royal bloodline of the Demon Clan.(It seems that someone from the Demon Clan rebelled and escaped.) She had a divine bow of the Demon Clan.(There are three divine weapons in total. One is the Dragon Clan's gun, the second is the Demon Clan's bow, and the third is unclear.) She seemed to have lost her memory. In the plot, the demons hunted down the girl, and one of the bad guys used an irreversible fusion with the demon beast. However, he was still forced back. There was also a girl who had once wanted to use her innocence to "frame" the male protagonist, which was to strip naked and shout in the house (although it seemed that the male protagonist's family lived there). But of course, he didn't shout it out in the end. The protagonist used his mouth to block his mouth, and in the end, he secretly fell in love with her. (It seems that her parents were peeping outside the door, but the door was crushed.) It seems that in the end they decided to go to the sealed place of the passage to the demon world to restore the girl's memory. That sealed place seemed to be guarded by many powerful dragons (I don't remember, it seemed to be a golden dragon). I remember that there was a female spear spirit in the spear and a male bow spirit in the bow. Moreover, the bow spirit seemed to be interested in the spear spirit. Some of the words might be in there, but I'm not sure. For example, there was a brief summary of the previous war, with his daughter in front... Chief Long followed behind. Other than the experts who had cultivated to the Void Realm… There was still a novel that he wanted to find. The main character was a vampire, but in the setting of this book, vampires had the blood closest to God. Vampires seemed to be unable to synthesize a certain substance in their blood (like Platelets), so after a period of time, they had to suck the blood of magical beasts. The protagonist was as beautiful as a girl. The life of a vampire was very long. It seemed that she went to a human college at the age of 50. She met a girl (who seemed to be a scientist). The background of the story was a war. The lives of the people were difficult. In the end, there were seven heroes who ended the war. One of them was the protagonist's old man (vampire). When the war broke out, the number of magical beasts decreased. His old man wanted to steal the blood of the war horses to drink, but he was persuaded by the protagonist's mother (later) to join the army. A long time ago, there was a God of Destruction. In the end, three Gods joined forces to seal him. They said that unless the God and the Demon King had something else, the three bloodlines would merge together and the God of Destruction could be reborn. The child of the male and female protagonists (which was far from being the case) met the criteria. The story mainly happened in the academy.