Dr. Cossack

Doctor Mikhail Sergeyevich Cossack (or Dr. Mihairu Serugeibicchi in Japanese) is a Russian scientist from Mega Man 4 who has his daughter named Kalinka and created all the eight Robot Masters, Toad Man, Bright Man, Pharaoh Man, Ring Man, Dust Man, Skull Man, Dive Man and Drill Man to send them and take over the world.

History
Dr. Cossack sent a letter to Dr. Light stating that he created the eight Robot Masters and his robots are reprogrammed by Dr. Wily and Mega Man was set out to defeat his robots and made his way to Cossack's Siberian Fortress. After Mega Man defeats Cossack, Proto Man appears with Kalinka and revealed the truth that Wily kidnapped her and force Dr. Cossack to build the robots as ransom. After the defeat of Wily, Cossack builds a robotic bird named Beat for Mega man, as a gift for saving his daughter.

Cossack Catcher
The Cossack Catcher is an invention that Dr. Cossack uses in the final stage of his castle. It was designed to resemble a prize catcher commonly found in the arcades. Mega Man must use Dust Crusher or Wire Adaptor to do some damage. As the claw is about to catch Mega Man, he must slide to avoid the grabbing and use many Wire Adaptors. Defeating him will make Kalinka come and warn Mega Man to not kill her father. He is not actually evil.

Trivia
In Ruby Spears' Mega Man, Dr. Cain bears a slight resemblance to Dr. Cossack.