Mijbil is portrayed as a pet that, much like more typical pets, exhibits traits of intelligence, friendliness, and a love for fun. His intelligence is evident when he manages to turn on the bathroom tap to get water for his amusement. This intellect is further demonstrated when he invents a game involving a tilted suitcase. He would place a ball on one end, allowing it to roll to the other side, then quickly dash to the opposite end to catch the ball. His friendly nature is seen in how he follows the author and responds when his name is called. Mijbil's fun-loving spirit is showcased through his playful activities. He spends most of his time playing, with marbles being his favorite toys. He would lie on his back and juggle two or more marbles on his wide belly, remarkably without letting any of them fall to the floor.