He wears a tabard-like garment, trimmed with faint runic inscriptions, a coat of arms on each sleeve, and breeches tucked into a set of lightweight leather boots. The heraldic design features a staff with a crescent finial crossed by a saber resembling an icicle, on a field representing a tundra.
He has a small bag slung over one shoulder and a conch hanging where a scabbard should be.
His nature as an elemental spirit frees Aquilon of many physical liabilities and leaves him somewhat resistant to physical attacks, but at the cost of being especially vulnerable to wards or forms or anti-magic, summoning and binding, and so on. Hot environments are uncomfortable and draining if he isn't protected, and thermal weaponry can be very dangerous regardless of its origins. He may not be able to physically manifest if weakened too much by one thing or another.
One of his more mundane skills and hobbies, developed to help pass the time, is simply drawing/sketching. Keeping up with changes in time and language of his visitors has also left him with some linguistic ability.