Koopatrol

Making their debut in Paper Mario, Koopatrols are armored Koopas that work for Bowser. These guys are high-ranking guards of Bowser's Castle.

These guys are found in Bowser's Castle in Paper Mario, they were shown patrolling Bowser's and Princess Peach's Castles after Bowser stole the castle and uprooted it into the stratosphere.

They are later found in Rogueport Sewers in Paper Mario: The Thousand-Year Door after Mario and his team clear Chapter 5. And there are also an advanced type of Koopatrol with red eyes, namely, the Dark Koopatrol.

Notable Koopatrols
The Koopinator

Paper Mario Stats
Max HP: 8, Attack Power: 4, Defense Power: 3

Tattle: This is a Koopatrol. They're elite Koopa soldiers. These are the highest-ranked guards of Bowser's Castle. In case you hadn't noticed, they're fitted with spikes. Don't jump on 'em. When their HP drops low, they'll charge up power for one last-ditch attack. The power of this desperate attack is 10. They've also been known to call in reinforcements when they're in trouble. Don't underestimate these nasty Koopas, Mario.

Regular Koopatrol
HP: 6, Attack: 4, Defense: 2

Dark Koopatrol
HP: 25, Attack: 5, Defense: 2