best friends to soulmates (King Harlequin x Female reader)

so you are Y/N (your name) L/N (last name), you are part fairy and part ghoul (yes it's from Tokyo ghoul but none of the characters from that series will exist in this AU) you are King/Harlequins best friend since childhood but you are also Bans little sister. You are on your own journey to find out who you truly are with the help of the sins
This is kinda my AU of the 7DS, you are also the only Ghoul alive after the demon clan extinct all ghouls expect you, so you are a rare creature, you are also a princess of the ghouls since some ghouls are alive, Ban and everyone who are your allies will not know you are a ghoul expect Meliodas until one chapter, you are also the 8th sin which is Y/N the rabbit sin of hope, your sin mark is on your hand, also Meliodas will have no feelings towards Elizabeth because in this AU Elizabeth is an enemy because she will be jealous that Meliodas is secretly in love with you so will you continue the book to start the jounrery