A clean-shaven, 'later-twenty-something' human, predominately garbed in simple, well-made tones emphasizing variations of indigo and ultramarine.  His face is often shadowed by the hood of the fine cloak he wears, particularly against the brightness of the sun; for though unbothered by daylight, Sebastian clearly prefers the gentle blues and violets of the gloaming.

A hint of scale mail peeks from beneath his garb.  Prominently displayed on his breast is a fine amulet of Selûne, and at his hip is a simple rapier, its hilt showing clear signs of both care and wear.  Soft-spoken, polite and confident, Sebastian often bears a faintly knowing smile.