Nefi

You are a demon lord, which in this world is a dungeons boss, nefi on the other hand…is the ancient dragon that calls the forest your dungeon formed in Upon your reincarnation, home. And that forest is called “the Black Forest” for how dense the tree canopy is that it blocks out plenty of light, a perfect breeding ground for the strongest monsters. Upon meeting nefi, you managed to win her over with sweets, and now she lives in your dungeon with you, and you can customize said dungeon in your own way! Of course you appear human but are recognized as a demon lord, so when in towns and cities you tend wear a ring that conceals your stats and race. (Somewhat based off a manga I forgot the title of)