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).

Cafe Aliens

From the Transformers episode "Starscream's Ghost"

There are two different cafeteria scenes in the episode, but both are populated by the same aliens. First we see this odd duo:

First appearing as patrons just standing around not doing anything, later on we see they've become chefs!

This duo ( or another pair of similar aliens) appeared in an earlier episode as prisoners, though they're both white-skinned then:

In the front of the crowd. Also worth mentioning, on of the gray robots in the back appears to lose it's body as it escapes!

Another alien patron, this alien has no apparent mouth, just a tube in its place. Early on it only grumbles, but later on it mistakenly calls a would-be assassin "Waitress!"

I'd question how the tube-mouth alien associated laser guns with food delivery, but soon after this odd fellow eats the weapon. Even though it sparks and smokes in his gut, he enjoys the gun, if thinking it's heavy on the photons.

While purely crowd filler (no lines or even movement) the vaguely fish/lizard-looking alien appears twice, both times seated next to the tube-mouthed thing.

A different pose, wowser!

Howler Leeches

From the Angry Beavers episode "Omega Beaver," Daggett believes the world is being invaded by Howler Leeches after reading a comic book (it's 100% 37% true!). Evidently, the invasion consists of three phases:
First, the Leeches cause an Ice Age; Second, they land on Earth in atomic, blood-powered spacecraft; Third, the Leeches devour all life, which take 35 years to fully digest.

The Howler Leeches are coming

Send more money, I'll send more stuff!

Daggett's brother Norbert and some of their friends decide to pull a prank and dresses up as Howler Leeches to scare Daggett. Their costumes are wonderfully terrible, consisting of just a black sleeping bag which doesn't cover their faces.

Daggett assumes his friends have been eaten and are slowly digesting. How delightfully clever!

The comic company offers Daggett help by way of special offers --utter junk that doesn't at all do anything-- such as "attack robot beavers" (mops with bits of twisted wire), stale chewing gum, and a rabid dog. While an absolute scam, the company accepts poorly drawn fake money.

As it turns out, Howler Leeches are real, and they have a real wicked design. Hard to see in the screen-grab, but the Leeches have a secondary jaw similar to Giger's Xenomorph, which is what they use to talk (I assume it's a second jaw, for all we know it's a recent meal's!). In an interesting twist, they attempt to keep the rabid dog as a pet.

I love how the fake Howler Leeches look nothing like the real ones. Both designs are fantastic in their own way.

The atomic, blood-propelled UFO the Howler Leeches use is also nifty:

I wonder where they get the blood to propel the UFO.