Arvin Ilario takes on the appearance of a Panamanian person in their early-thirties, standing at about 6'4. They are tall and skinny, though still muscular, they have the build of a sprinter or an endurance runner. Their skin is a tanned golden colour and honey brown eyes, they have shoulder-length dark brown hair with an undercut, often times you will find them with their hair pulled back into a ponytail. They often wear nice blouses and skirts when in office, but when on missions they wear a simple jumpsuit to wear under the Golden Eagle armour.
However, when they're in a safe space, they will drop their Chameleon Chip, showing their true Olonos form. They have an identical build to their Human appearance, though their skin is a pale yellow ochre colour instead. Their eyes are a vibrant shade of ultramarine blue, and their hair looks like strands of pure golden threads. They wear the same kinds of clothing that they wear while disguised, finding the aesthetic very comfortable and fitting of their build.