The mandrill alien is very self-confident, assertive and narcissistic. He perceives himself as a superior being, a notion he supports with his claimed IQ of 300, which he frequently boasts about to his targets. Success in his plans also helps to inflate his massive ego. He possesses a low opinion of humans, regarding them as primitive creatures characterized by barbarism and ignorance. However, his opinion may change if he comes across one who exceeds his expectations, as he praised Momo for lasting long enough to avoid getting turned into a can by his Territory Can.
Taking great pride in his intellect, he finds it intolerable for someone to label him as stupid, resulting in him exhibiting aggressive behavior towards the one who made the remark. Ironically, he also finds it offensive to be called "monkey" despite his appearance.
Kami High, the area of attack.
The mandrill alien.
Although he possesses a strong sense of pride, he was not so overly arrogant admitting that he couldn't comprehend how Momo avoided his first can attack directed at her, however, he did believe that the unforeseen moment must have been noteworthy if it managed to exceed someone of his intellect. He is also very persistent, as he was determined to take down Momo after she foiled his plans. He has a unique speech pattern in which he ends almost every sentence he speaks with the word "bro" and, as his fight against Momo and Okarun drags on, he also adds "ook" to his vocabulary.
The primary abiltiies of the mandrill revolve around cans of soda. When attacked, the mandrill alien will furiously launch a barrage of cans towards his enemy in an attempts to change his victims into cans themselves.