Here are some cool gamertag ideas for "My Hero Ultra Rumble":
- HeroicNemesis
- QuirkedOutVigilante
- UltraValor
- NobleSquad
- RumbleReaper
- EpicHeroics
- MythicMaverick
- ValorVortex
- AlloyedAvenger
- RumbleRanger
Feel free to mix and match or modify them to create something that fits your personality!