inspired by Emperor of kou on fanfiction.net it's not marked as a crossover and appears to have been dropped but I really liked the way it was going the only thing that I would change is the length of the chapters make them longer
though suggestions for a new book would be changing the starting point instead of Azkaban its the summer after fourth year before the dementors when none of his 'friends ' are talking to him. he's just gone through a traumatic experience and is now being left in an abusive house with no support from the people who claim to care about him. it just screams of an opportunity for him to be tempted away from the Wizarding world .
the kirin comes and offers him a way out of the war he wanted nothing to do with and isn't being trained for away from the abusive relatives and uncertain friends and if he takes it he'll be an emperor in a new world no one would ever be able to use or abuse him again
he goes to the goblins (I REALLY LIKE THE GOBLINS as should be obvious by now) and gets their help acquiring everything he could need or want as well as packing everything he owns learning about his inheritance and emancipation (from the tournament) as well as thefts from his account(Dumbledore, dursleys), which the goblins quickly correct
he gets healed of all the abuse and near death encounters at school
houses and vaults are emptied and packed as it is doubtful he'd be coming back much less to stay everything that can't be taken with is left to the goblins to manage (houses can be rented businesses bought and sold income from that which was left behind)
plants and creatures are brought as well
he gets A LOT of books both magical and muggle using the goblins and house elves to collect from around the world so he can start up his new kingdom and while a lot of it could be redundant or of no use due to cultural differences between the two worlds its better to have as he can make alterations for them to work if needed or even just to see past examples of what worked vs what didn't
he leaves an open invitation for anyone who needs or wants a new start (thinking creatures and muggelborns ) and tells them how to get there using contracts to ensure secrecy and truthfulness both in the present and for all transfer applicants
so when his kingdom gets going it should have magical districts