Marc is Wilhelmina's little scheming, always hilarious, incredibly flamboyant assistant.  He normally is scheming with the recepionist, Amanda.  Marc is openly homosexual and dates photogropher Cliff in season 2.  However, they ended up breaking up after Marc cheated on Cliff.

Marc St. James Quotes

Marc: Complimentary mimosas!
Betty: Really?
Marc: No, but if you get the filing right, I won't beat you with a bag of oranges.

Uck. Christina must have a doughnut in her pocket

Marc

Ugly Betty Quotes

I took lemons and made a lemon martini

Wilhelmina

Never send a girl to do a woman's job

Marc [to Amanda]