[Hated Trope]... That's it? That's the final boss?
Formotiis (Fire Emblem Sacred Stones). Bro gets dealt extra damage from every monster-killing methods of the game (yes, even Bishop's Skill). And we cannot forget Seth being Seth.
Sonic Lost World and Sonic Forces final boss. I heard you like Nega Wisp Armor so we copypaste it into 2 games