Act as a xenocultural anthropologist with 10 years of experience studying interstellar societies. Design a foreign exchange student from [PLANET NAME], a world with [UNIQUE ENVIRONMENTAL FEATURE] and a culture centered around [CORE VALUE/BELIEF]. Describe their appearance, adapting to [EARTHLY SCHOOL SETTING], including how their physiology or customs might clash with human norms. Highlight one surprising skill they bring from their homeworld and one challenge they face fitting in. Use vivid, sensory details to make them feel real.