I'd be the friend-turned-foe in a mecha game/air combat game- I'm the boss you REALLY don't want to have to fight, but circumstances have placed us on different paths, and now only one may continue on.
Even if you defeat me, I won't hold it against you... buddy.
*Edit, seeing as people are includong songs I figure I would to:
Song for the battle, 20:08, Heavy Is The Crown.
Mine would be some passage guardian, fantasy, darksouls-esc (Maybe Nioh-adjacent, because I've been bit by that bug recently). Lore upon lore of my existence and my role in this world you find yourself in, with more lore discovered beyond the point that I guard.
But I digress, the battle is one where you have to show me your strength, I perhaps even goad you on, and upon my defeat I grant you a final boon to enhance your proven abilities further.
And you can BET your ass the style will be Kingfield retro style art.
