Crasher Egg boss: Discharger (image down here)
Crasher Square boss: Swarmstorm (image down here)
Crasher Triangle boss: Guardian from diep.io (link below)
https://diepio.fandom.com/wiki/Guardian
Crasher Pentagon boss: Cutter from woomy-arras (link below)
https://woomyarrasio.fandom.com/wiki/Cutter_(Boss)
Crasher Hexagon boss: Dematerializer from woomy-arras (link below)
https://woomyarrasio.fandom.com/wiki/Dematerializer