Appoplexian

Appoplexians are felinoids with huge muscles from the planet Appoplexia.

Appearance
Appoplexians resemble muscular bipedal tailless tigers with individual claws sprouting from each wrist. Their fur varies in color, but has been shown to be either orange, maroon, brown, or white. They have white or cream muzzles, hands, stomachs, chests and feet, and black stripes on their head, shoulders, back, and legs. They also have four-fingered hands, three-toed feet, and quill-like eyebrows over each eye.

Behavior
Appoplexians are powerful, argumentative, and extremely aggressive. They have the urge to fight anything that breathes because they believe that any problem can be solved by hitting it "a lot". This anger even extends to inanimate objects, and can lead to harm for both themselves and others.

Because of their disjointedness, Appoplexians are prone mixing up metaphors. Mentally, they are more cat-like than Revonnahganders, hence why Nyancy Chan was able to subject Rath (Ben Tennyson's Appoplexian form) to her cat-controlling powers.

Appoplexians are prone to beginning a conversation with the phrase, "Let me tell ya somethin'....!", followed by either a person's full name or position. For example, Rath refers to Khyber as the "self-proclaimed greatest huntsman in the galaxy", Vulkanus as "baby man", and Grandpa Max as "G-Pa Max".

Appoplexians have animalistic tendencies such as growling, roaring, and relentlessly seeking food when hungry. These traits may often cause them to follow their natural instincts under certain circumstances, which will subsequently override their mindset and completely distract them from whatever they might be doing.

In relations to other species, Appoplexians have recently formed a truce with the Lewodans, and are good friends with the Vaxasaurians due to their prowess in gladiatorial combat.

Powers and Abilities
Appoplexians have immense strength, being able to punch through a wall and lift a Cascan with relative ease.

Appoplexians are durable enough to withstand a powerful laser at point-blank range without a single scratch.

The claws on an Appoplexian's wrists can both extend and retract. They are also fireproof against a Pyronite.

By stabbing the ground, Appoplexians can create a shock wave strong enough to burst a rock into rubble or knock something over.

Appoplexians possess enhanced dexterity and quadrupedalism, as they can run on all fours like an ordinary Earth tiger.

Weaknesses
An Appoplexian's brain is hardwired for aggression and as such, the species' greatest weakness is their low intelligence and highly aggressive temperament. As a result of their obsession with violence and anger, they are difficult to stop once they start fighting.

An Appoplexian's temperaments can cause them to easily forget things and become easily distracted. This has been demonstrated with chasing after meat.

Because they are cat-like, Appoplexians can also be distracted by and chase after dots of light and smaller animals such as mice and rabbits like ordinary Earth cats.

Despite their enhanced strength, according to Duncan Rouleau, Appoplexians are physically weaker than Tetramands.

In the original Ben 10 continuity, Appoplexians are hydrophobic like ordinary Earth cats. However, this weakness does not appear to apply for Appoplexians in the reboot series.

Certain high pitched sounds are fatal to Appoplexians.

Omnitrix Transformation
The Omnitrix's Appoplexian representative is named Rath, who first appeared in the Alien Force episode "Con of Rath". Rath has appeared in every subsequent series.

The Ben Tennyson of Dimension 23 has an equivalent of Rath, who was confirmed to exist in the Omniverse episode "It's a Mad, Mad, Mad Ben World: Part 2".

Rath has also been used by the Prime Timeline Gwen and Azmuth, Albedo, and Mad Ben.