Compared to Orbot, Cubot is described as the "funbot" and has a rough-edged personality. While not perfect of character, he is loyal by default, though he will only obey orders after being threatened as dictated by his programming. He is very dim-witted and slow on the uptake, having trouble solving a puzzle meant for babies, and is gruff and gritty like a beat cop. Beneath his bumbling exterior though, lies more violent and aggressive tendencies, as Cubot took charge to get Eggman out of jail "his way" after several failed attempts, which involved blowing the jail up with a disintegrator ray.
Cubot has at times shown a lot of self-consciousness and low self-esteem. He is somewhat depressed over being a soulless machine and ponders over whether he has the making of a good minion or is just a redundant comic relief. His personality can even be affected by whatever accent he voice is set to, causing him to adapt mannerisms and behavior associated with the type of accent in question.