Dr. Doppler

Dr. Doppler (Ｄｒ．ドップラー) is one of the main antagonists of Mega Man X3. He was the first Reploid scientist, and was very well known. Early in the story of Mega Man X3 he claimed to have created a vaccine to the Maverick virus, and he also created Dopplertown. Unfortunately, it soon turned out that the "vaccine" was a placebo, and Mavericks started to pop up everywhere. Thanks to Dr. Doppler's "vaccine" more Mavericks were created. Doppler then became the leader of the Doppler Army, an army comprised of some of the most powerful Mavericks the world had ever seen. Later on in battle, it is revealed that Sigma took control of Dr. Doppler and forced him to create a new battle body for him. He also rebuilt Vile and hired Bit and Byte of the Nightmare Police to destroy X and Zero. Dr. Doppler's fate depends on whether or not Zero is still active. If Zero is still active, Zero comes in to take out the Sigma virus in the end. But if Zero had to go back for repairs, Dr. Doppler makes one last move and self-destructs, taking Sigma down with him. In the former ending, Doppler's fate is never revealed.

Trivia

 * Dr. Doppler seems to have been named after the Doppler Effect