Tango

Tango (タンゴ) is Mega Man's feline pet created by Dr. Light in Mega Man V. It rolls toward the screen to attack enemies.

Mega Man 10
After more than a decade, Tango reappears in Mega Man 10 as Auto's assistant at the shop when playing as Proto Man.

MegaMan Battle Network series
In the MegaMan Battle Network series, Tango's counterpart is a Navi Customizer program that appear once per battle in multiplayer NetBattles to heal the player and give him a barrier.

Mega Man & Bass CD data
A supporter robot that is remodeled from a pet robot. It rolls toward the enemy to attack.

"Meow Meow."

Good point: Rolling-stone

Bad point: Creature of moods

Like: Mistletoe

Dislike: Rush

Trivia

 * In the CD Data of Tango, his good point being "Rolling-stone" is probably based on the famous 60's Rock Band "The Rolling Stones." It could also be a reference to the way Tango attacks.
 * Tango dislikes Rush, more than likely because Tango is a cat-robot and Rush is a dog-robot.