Roy is smug, mischievous, annoyed, friendly if he wants and he often often makes loud, deafening sounds like a radio. Ross is more laid-back and mostly non-verbal, kinda introvert, honest and often quickly and anxiously whispers something unintelligible in multiple voices with an echo. Robert is polite, happy-go-lucky, talkative, mischievous and always looks intently at the person. All three monsters cannot speak and can only make growls.