Karim Atlas fights as part of the Psycho Armor Corps, a unit of child soldiers utilizing psychic powers to protect Earth from alien invasion. His psychogenesis ability allows him to manifest solid matter directly from mental energy. He pilots the Psycho Armor Garom, an 11-meter-tall mecha weighing 63 tonnes.

Karim possesses ambiguously brown skin, with his name implying potential Arab descent. He exhibits loud-mouthed tendencies and a big appetite, initially prone to cowardice and laziness. His dark past involves losing his father during the alien attack, aligning him with the team's orphaned members.

His character shifts from self-preservation to courage after witnessing the death of fellow soldier Kurt Buster. This event galvanizes his dedication to the Corps' mission, cementing his role within their ragtag band of misfits.