Here are some fun and silly username ideas similar to "buffkittenmuscles":
- SassyPancakeWarrior
- NinjaPicklePants
- FluffyDragonSlayer
- CactusCowboyGamer
- DancingPenguinNinja
- SparklyUnicornWrestler
- WittyOctopusJuggler
- AtomicFuzzyBacon
- CheesyNachoBandit
- EpicPuppetPirate
- GiggleMonsterTaco
- WhimsicalSquirrelHero
- TurboBunnyAdventurer
- CosmicPuddingLord
- SpunkyLlamaDancer
Feel free to mix and match or tweak them to suit your personality!