Who is Henry clerval? What is he like?

Henry Clerval was a friend and schoolfellow of Victor and Elizabeth from childhood; he was murdered by the Creature.

Henry Clerval

Victor's best friend since childhood. Fascinated with the history of mankind, he is Victor's intellectual opposite. He studies language at the University of Ingolstadt and is totally unaware of Victor's creation. He, too, will be murdered by the monster; he is perhaps a symbol of the destruction of Victor's own goodness and potential.