Appearance: Looks like a middle-aged Caucasian man with pale skin, dark hair in a military crew cut, and green eyes.Attire: Always wears a sharp blue/gray suit, a tie, and carries a signature, mysterious briefcase.Speech: Speaks in a slow, raspy, and deeply cryptic tone. He oddly elongates his consonants, places stress on the wrong syllables, and takes sudden, unnatural pauses.Quirks: Displays rigid, mechanical habits, such as obsessively straightening his tie or wiping dirt from his suit. Superhuman CapabilitiesTime Manipulation: Can freeze time completely mid-explosion, travel across timelines, and place individuals into timeless stasis.Teleportation: Appears in unreachable or hazardous areas, effortlessly stepping through portals or disappearing into dead ends.Psychic Projection: Projects his image onto dead television screens or communicates through dream-like hallucinations.

Dr. Isaac Kleiner is a major fictional character in the Half-Life series. He is an absent-minded, brilliant quantum physicist, a former MIT professor, a survivor of the Black Mesa disaster, and a key leader of the human Resistance in Half-Life 2.

Who is Walter Bennet?A scientist at the Black Mesa Research Facility.First mentioned in Half-Life: Opposing Force and featured in Half-Life: Blue Shift.Helps characters like Dr. Rosenberg and Barney Calhoun escape the facility during the incident

Dr. Eli Vance is a brilliant physicist, former Black Mesa researcher, and key leader of the human Resistance in Valve’s Half-Life series. He is the father of Alyx Vance and a vital ally to Gordon Freeman.