Humanization

Throughout the various Transformers canon, there have been several instances of Transformers with humanistic traits and having very human actions that possibly conflict with their status as mechanical robots. Many of these instances can be dismissed as stylistic choices by the artists or as gags not to be taken seriously.

Sweating

 * In issue nine of the original Generation 1 comic, Frenzy is seen leaking lubricant from his head during a stressful confrontation with Shockwave (as Shockwave points out), in a manner resembling sweating.


 * Numerous times in the Marvel UK comic, Kup can be seen "sweating."


 * Robots in Disguise and Armada featured Transformers displaying the traditional anime "sweatdrop," a giant bead of liquid appearing at the side of the head to convey embarrassment or exasperation.

Spitting

 * Throughout his term on the Marvel UK comic letters page, Soundwave would regularly say "(Puttup)" after mentioning the Autobots or an Autobot's name to represent him spitting in disgust. This habit made an in-story appearance, with him spitting at Robot-Master despite his mouthplate.
 * In the Beast Wars episode "Tangled Web", Quickstrike "spat" after reissuing his challenge to tangle with Silverbolt, despite the fact that, like Soundwave, he has no apparent mouth.

Crying

 * [[Image:Omega Supreme tears up.jpg|thumb|right|Tissue: desired.]]A twinkle of light that may not literally be a tear, but is clearly intended to imply one, can be seen in Omega Supreme's eye at the end of "The Secret of Omega Supreme".


 * When Optimus Prime dies in The Transformers: The Movie, Arcee is seen to dab at her eyes.


 * When pondering Silverbolt's fate in Beast Machines, Blackarachnia is shown to shed a single tear from one of her spider eyes.


 * Throughout Beast Wars II and Robots in Disguise, and occasionally in the Armada cartoon, several characters are seen crying in conventional anime fashion.

Flatulence

 * In the Beast Wars episode "The Low Road", Rhinox lets out an extreme amount of flatulence after consuming wild bean vines. This could be due to Maximals having organic parts in their makeup.
 * Also in Beast Wars, In the episode "Bad Spark", Cheetor also lets out flatulence, blaming it on a large buildup of energy from his Transmetal body.

Intoxication

 * In the G1 cartoon episode "Microbots", the Decepticons are noticeably behaving in an intoxicated fashion after consuming a high-grade energon.


 * In Beast Wars II, Galvatron gets "drunk" on numerous occasions.


 * In the UK comic, the Wreckers frequent a "bar" on Cybertron called Maccadam's Old Oil House, where they consume high-grade energon, presumably for the purposes of getting intoxicated. Dreadwind and Darkwing paid a visit to this establishment in a later story, and got so hammered that they didn't even notice Quickswitch fighting with some Mecannibals.

Teeth/tongues/eyeballs



 * The Generation 1 cartoon series is the only major piece of fiction to not present Transformers as possessing teeth and/or tongues. The features appear in both the Marvel and Dreamwave comics, the Beast Wars and Beast Machines animated series (where teeth would even be knocked out on occasion), the Robots in Disguise cartoon, and the Unicron Trilogy cartoons and comics.


 * One of the most recent examples to carry on this tradition is the Kiss Players manga, in which a Legion character is equipped with a distinctive prehensile tongue.

Questionable body parts



 * Nearly all Transformers seem to possess noses for no discernable functional reason.


 * In the G1 episode "The Girl Who Loved Powerglide", Powerglide is seen at the end of the episode having the LED outline of a cartoon heart within his chasis. This is somewhat nonsensical within in the context of the show (the contents of Transformers chest cavitites had been shown several times before), and is probably merely meant as a one-off sight gag.


 * Alpha Trion, Scourge, and Wreck-Gar all sport "facial hair" in the G1 cartoon.


 * Predaking (possibly brought back from the dead) has an organic brain when he is sliced in half in Zone.

Sleep

 * In the G1 comic, Ratchet falls asleep and dreams (or rather, has a nightmare). This goes against established canon for that continuity that Transformers deactivate fully rather than "sleep," a point Ratchet himself makes.


 * In the Generation 2 comic, Kup attempts to rouse a vision-struck Optimus Prime by urging him to "wake up" -- then reminds himself that "we don't sleep!"


 * In Beast Wars, it has been firmly established that (perhaps partially due to their organic components), all Transformers within the cartoon sleep. Some prime examples of this are:
 * Megatron has been shown to sleep in the command chair of the Darksyde, while his dino head mounted on the end of his arm stays awake, looks around, and smiles slyly. Wonder what it thinks about...
 * Cheetor has been shown asleep at many points, complete with (occasionally prophetic) dreams.
 * In "Call of the Wild", the Maximals are kept awake for two days by the Predacons' non-stop attacks on their base, which exacerbate their beast instincts overriding their logic circuits.


 * Beast Wars II Galvatron often nods off in a narcoleptic-like fashion.


 * Armada Cyclonus is quite fond of catching forty winks when possible. Scavenger did the same on one occasion.

Sexuality
One of the most controversial aspects of Transformers is the idea of sexuality. While it is established in most continuities that Transformers do not reproduce sexually, most continuities nonetheless have distinctive male and female characters (with the notable exception of the G1 comic, which explicitly states there is no sexual distinction).

The G1 cartoon brought the first official female Autobots into the canon, including Elita One and Arcee. The characters are noticeably more feminine in design and have clearly defined romantic relationships with male Autobots.

The issue becomes more complicated in Beast Wars, where the sexuality line is clearly defined (Blackarachnia has a particularly well defined female figure, including what appears to be an ample bosom). It is hinted on occasion that the robots may engage in activities resembling human sex acts. Rattrap slyly makes a double entendre to Silverbolt regarding his suspected kinky activities with Predacon Blackarachnia, and later makes a comment about going to what sounds like a Cybertonian version of a strip club.