Taxman

Biography:
Taxman is the antagonist in Batman Shadow Knight in the episode Paying the Dues when he abducts Batman from Wayne Manor. He recruits a henchman named Elongated Man, but upon realizing that Elongated Man is gay, joins in chastizing and firing Elongated man. He is eventually heroically murdered when Young Bat pushes him off of a rooftop.

Personality:
Greedy, evil, and politically moderate ("a Republican that is just kidding themselves")

Powers/Abilities:

 * Wealth
 * Acquisition of wealth
 * Money Counting
 * Kidnapping superheroes
 * Auctioneering

Trivia:

 * Any relation of the taxman to proponents of big government are strictly coincidental, the actual inspiration is likely Mr Krabbs from Spongebob Squarepants.