Facial hair
From MediaWiki

Some Transformers have facial features that resemble human facial hair. These features sometimes indicate age, but this is not always the case.
Transformers with facial hair
Generation 1

- A3/Alpha Trion
- The moustachioed bartender
- Detritus
- Early Decepticon leader
- Riker
- Scourge
- Sweeps
- Unicron
- The Venerable Ones
- Wreck-Gar
Beast Era
- Alpha Trion (Wreckers)
- Cheetor (Transmetal 2)
- Longrack's father, grandfather, great-grandfather, and his ancestors
- Ramulus
- Silverbolt (Beast Machines)
Unicron Trilogy

Shattered Glass

Movie
- The Fallen (braided beard)
- Jetfire (beard)
- Ratchet (walrus moustache)
- Roadbuster (goatee and sideburns)
- Leadfoot (beard)
- Topspin (bushy beard)
- Sentinel Prime (mustache and braided beard)
- Wheelie (eyebrows and whiskers)
- Wheeljack/Que (mustache)
Animated

- Alpha Trion (Mustache and Beard)
- Dead End (Van Dyke)
- Dirt Boss (Mustache)
- Highbrow (Mustache)
- Huffer (Mustache)
- Jazz (Jawline, with Soul Patch attachment)
- Mixmaster (The Lemmy)
- Optimus Prime (Goatee)
- Pipes (Mustache)
- Prowl (Goatee)
- Scrapper (Sideburns)
- Starscream (Goatee)
- Tracks (Soul patch)
- Wheeljack (Jamie Hyneman's face)
- Wreck-Gar (Van Dyke)
- Motormaster (The Lemmy)
Hunt for the Decepticons

- The new lab assistant (goatee)
Prime
In Animated, it was beards. In Prime, it's some bitchin' eyebrows, presumably because they're more expressive. Plus it means you see less of that 'soft metal' effect.
- With the exception of those who lack individual optics at all, like Soundwave, Shockwave, Vehicons, Decepticon Miners, and Insecticons, all characters in Prime have visual eyebrows.
- Starscream, Smokescreen, and Knock Out have painted-on goatees.

