Henchman 21 is sadly considered one of The Monarch's most loyal and best hench men.  He's normally always seen with his partner-in-crime, Henchman 24, who was tragically killed at the end of season three.

Now, Henchman 21 has been wandering around with the Orchard Street Wolf Pack trying to raise his old friend from the dead... or get him cloned.  Whatever works.

Henchman 21 Quotes

Henchman #24: Boss, there's a monster down here!
Henchman #21: I think it was two ninjas taped together to make one giant ninja!

Henchman 24: Come on! They have one female servicing a large group of males. That implies a species that lays eggs.
Henchman 21: Oh my God, you're crazy! They're so obviously mammals!
Henchman 24: Please! She'd be in estrus 24/7 if she didn't lay eggs.
Henchman 21: Smurfs don't lay eggs! I won't tell you this again! Papa Smurf has a fucking beard! They're mammals

Venture Bros. Quotes

Hank: You are not the boss of me
Sgt Hatred: Au contraire, I am tony danza to your spunky Alyssa Milano. I am full on Charles In Charge of you

Hank: Is it just me or does every Nazi want to clone Hitler? It's like the only they think about
Srgt. Hatred: It seems that way, right. I guess when everyone hates you, you just fixate on making rotten Hitlers