R.O.B. & Professor Hector are a pair of characters that appear in Kirby's Dream Land 3. R.O.B. originated as an accessory for the NES, and Professor Hector originated from the games Stack-Up and Gyromite, also known as Robot Gyro in Japan. They appear in the sixth level of Sand Canyon. Professor Hector wants Kirby to find the five parts of R.O.B., so that he may be reassembled. If Kirby finds all of the parts and obtains them in the correct order, he will be rewarded with a Heart Star at the end of the level.
R.O.B. also appears alongside Kirby in the Super Smash Bros series; he appears in Super Smash Bros. Brawl, Super Smash Bros. for Nintendo 3DS and Wii U, and Super Smash Bros. Ultimate as an unlockable character.
R.O.B. stands for "Robotic Operating Buddy."