Henri Dyson

Background
Black Mesa hazardous materials expert. Sent to work at the decomissioned sector after he handled hazardous materials without gloves... and punched Breen.

Uses his own red H.E.V. Mk III (without gloves).

Trivia
Players find him during the chapter "Nostalgic Frantic" (port of the mod "Alpha in GoldSRC") alongside Jules Poincaré in the decomissioned areas of Black Mesa, nearby the old X-Lab, around the place with old H.E.V. suits.

He canonically dies, either during gameplay by an enemy or later on after Black Mesa is nuked.

This character is just an easter egg about out one of the discarded versions of Gordon Freeman's name and design.