Sure! Here are some intimidating and powerful names for characters that could fit into a universe like "My Hero Ultra Rumble Academy":
- Obsidian Fury
- Vortex Vengeance
- Titan's Wrath
- Inferno Specter
- Shadow Striker
- Chaos Reaper
- Abyss Sentinel
- Wraith Enforcer
- Phantom Blitz
- Cinder Scream
- Dreadnought
- Nemesis Howl
- Ravager Eclipse
- Iron Loathe
- Savage Gale
Each name evokes a sense of power, danger, and mystery, making them great choices for a compelling character in a superhero academy setting!