Oohh...
Crazy Ivan, Red Alert 2. "I lost a bomb, do you...have eet?"
That you can combine him with Yuri to send hordes of cows, civilian cars, etc. into the enemy base and harass them doesn't hurt either!
The Overlord Tank, Command and Conquer Generals. "They all look PUNY from here!".
...yeah. Versatile, feared, powerful, can run over other tanks and house five rocket launcher units. What's not to love?
Dreadnaught, Dawn of War: Least balanced unit in the history of unbalanced units. THREE of these things is all I ever needed to complete any given mission in the original game (including the last one), no matter what. Later on they became a bit more balanced, but still fearsome powerhouses. The name fits very well.