Mantis Tractor

From the movie Coraline

In the seemingly ideal Other World, the Other Father drives a mechanical praying mantis tractor. It spits out seeds and water as it crawls around the garden, and it cuts down plants with it's forelegs, making it a great gardening tool. Although controlled by the Other Father, the mantis tractor appears to be semi-autonomous.

Being a mantis, it could also get rid of pesky aphids.

The mantis tractor also has a rotor than lets it fly into the air. Not sure how often a gardener would need that, but it's always great to have options.

Later on the mantis tractor fuses with a pumpkinized Other Father and a pair of of mechanical, piano-playing hands in an attempt to stop Coraline from retrieving a child ghost's eyes. The Other Father, not wanting to hurt Coraline, broke free long enough to give her the ghost eyes (which where contained within the mantis tractor's gear shift) before plunging the contraption and himself into a pond to their deaths.

The Other World also features insect-themed, semi-autonomous furniture, which take a dark meaning as the Other Mother reveals herself to be an evil spider-like witch.

For those in the know: JERK WAD

Space Pirate Cargo Drone

From Metroid Prime 3: Corruption

Just a minor, non-aggressive labor drone in the Pirate Homeworld. Doesn't attack or anything, rather it spends all it's time lifting and moving some crates around. But it's also carrying something strange...

Hey, what's that above the eyes?

Oh dear, it appears to be someone's head!

This grisly secret is near impossible to see in regular play, as the tiny drones usually stay far from the player, but the game lets you 'scan' most objects to see the it's 3D model (as is being done here) as well as a bit of back story. Of course, the cargo drone's scan doesn't even acknowledge the existence of the strange little head, much less reveal any reason as to why its there. In fact it implies it's just a robot.
Things get even weirder when you look at the Space Pirate Militia model.

A perfect match, but doesn't explain why Pirate heads in the drone. Are they babies being transported? Is it a form of punishment?

Pirate Militia are slaves and criminals within the Space Pirate forces, and are notably thinner. Upon closer examination they look like an eel in a mechanical exoskeleton. Perhaps Pirates are naturally limbless 'eels' and have to rely on mechanical bodies, or perhaps the radioactive element Phazon the Pirates use in vast quantities atrophied their bodies and rebuilt them with machinery, or maybe the Militia Pirates had most of their body parts removed as punishment? Regardless, the Militia don't appear to be hampered in their movements.

Looking back at the cargo drone, the head doesn't appear to be severed (i.e. a beheaded criminal), rather it looks like a full 'eel.' Two prongs hold it in place, and may or may not connect into it's central nervous system allowing it to control the drone. It's still substantially smaller than the Pirate Militia.

Space Pirate tech as a whole is an unsettling mix of mechanical and organic that changes drastically from one game to the next, and the games themselves don't elaborate, so we may never know what's going on here. Perhaps that's intentional.

Goras

The Boss of Star Fox 64's "Titania" level. Apparently just an alien monster, not part of Andross's schemes.

Just look at this poor thing. Droopy eyes, barely any flesh on him (most of which falls off as it takes damage), mouthparts flapping pitifully, looking like some sickly mix of dog and unicorn. I love it.
Despite appearances it's a formidable foe, able to fire lasers and even pull itself back together. The only way to actually harm it is to shoot its barely concealed organs.

I'm not sure what exactly these are. Hearts, maybe?

Goras was only one of a species on Titania. Several skeletons looking near identical to it are littered across the level.

Goras is set to reappear in the 3DS remake with vastly improved graphics, though still as sickly as ever. I daresay he looks even more skeletal and emaciated.

Goras (or another of its species) also appears in the manga Farewell, Beloved Falco, under control of the evil Captain Shears. This Goras is nearly all-green and sports some seemingly artificial tubes sticking out of its head and back, presumably added to control it (or, if its the same one from the game, to revive it).