If we think about his new personal banner with the marriage requirements of his mother and uncle the answer is obvious. Have the MC have two wives like his ancestor the conqueror did. First would be a woman from the Vale that will help him solidify his expanding rule there. His cousin can do her tour of the realm meeting the next generation of nobles and build her future small council from the new supporters. She could even start her visits in the Vale helping him find a wife they both agree with. Then when he is done expanding in the Vale he can marry her as his second wife. The children of the Vale wife will inherit his new castle and Royce name while his cousin's children keep the Targaryen name.
I found a typo the broom for sale in the store window of diagon alley was a Nimbus 2000. The Firebolt broom was not created till Harry Potter's third year at Hogwarts. That is when he received it anonymously by owl mail from his god father Sirius Black. It was also the Firebolt that was used by the Irish team to win the quidditch world championship.
Just found your book and wanted to notify you that your book title is wrong. A Succubus is a female sex demon, the male version is called an Incubus. So since the hero is a guy it would be a Incubus System.
If you wanted to summon a wizard to infuriate Lucius Malfoy you could bring back Regulus Black from the dead. He died while recovering Slytherin's locket from the cave full of infury sending the elf Kretcher to safety. With Regulus Black alive even with Sirius in jail at Azkaban Draco Malfoy can't inherit the house Black properties, vaults, and seat at the Wizagamut that Lucius needs for passing anti-muggle laws.
A person that died before Harry Potter started school at Hogwarts that could possibly be summoned would be Luna Lovegood's mother. In the books it said that Luna's mother worked at home by creating magic spells. Mrs. Lovegood died while Luna was watching through a crack in a door when a spell she was crafting failed. It would be nice to let her reunite with her family.
Ah one person I just thought of that you could summon would be a younger Neville Longbottom's mother as although she is still currently alive she is stuck in the long term recovery ward of the wizarding hospital with her husband as they are both pretty much brain dead due to the torture that Bellatrix and the Lestrange brothers put them through.
Until the resurrection of Voldemort there are not very many women who he could summon from the original seven movies. Unless you plan to summon the older/younger versions of the students or teachers in Harry Potter's school years like an older Hermione Granger or a young Mcgonagall. If you watch the newer Fantastic Beasts movies you could find a lot more like a younger Nagini that is not stuck as a snake yet. He might be able to get Dumbledore to help cure her bloodline curse. Then I already mentioned Dumbledore's little sister would be a great summon as well. If he gets some temporary summon cards you could have fun with it by having Voldemort have to fight against a young Grindelwald in the fourth year graveyard battle for instance. I hope this helps give you inspiration as I look forward to the future story.
Fun fact if the MC summoned Lily Potter nee Evans then Harry Potter would not need to live with the Dursley family as his mother fulfills the requirement for him living with blood relatives to keep his magical protection from Voldemort. Only thing is the retired Professor Slughorn will likely have to comeback to work at Hogwarts if Lily is alive as she would eventually find out that Snape is the one that got her and James Potter murdered.
Myrtle Warren the girl that Voldemort killed at Hogwarts while still a studend that became the ghost Moaning Myrtle could be summoned during second year and get to finally help everyone know about the basilisk and Tom that killed her and get Hagrid his legal rights to own a wand back. It is strange that nobody seems to have bothered to ask Myrtle's ghost how she really died until the chamber of secrets was reopened.
If his father married the elder daughter of the MC's aunt that would still let her be a queen but just of the step stones. That would leave the children of the green queen to marry into both of the two royal Targaryen households. There still is a chance of one of the heirs flipping the planning board for the future weddings but should leave everyone happy.
Game of Thrones: The King of Bronze and Fire
Book&Literature · michaeI