Roboko (ロボ子 Robo-ko) or Yuriko (ユリ子 Yuri-ko - 1973 only) is a "Good-Friend Robot" that Doraemon brought back from the 22nd century to be Nobita's friend.
Appearance
1973 anime
Yuriko is a robot girl with an appearance of a 10-12 years old girl. She has fair skin, blue eyes and red hair in a yellow bow. She wears blue dress and boots.
1979 anime
Roboko is a robot girl with an appearance of a 10-12 years old girl. She has fair skin, black eyes and black hair with short trims and bangs with a red ribbon. She wears pink dress and white boots.
1993 remake
Roboko is a robot girl with an appearance of a 10-12 years old girl. She has fair skin, black eyes and pink hair with short trims and bangs with a red ribbon. She wears pink dress and white boots.
2005 anime
Roboko is a robot girl with an appearance of a 10-12 years old girl. She has fair skin, brilliant grayish green eyes, green hair with short trims and bangs with a red ribbon. She wears a yellow dress with a pair of red boots.
Personality
Roboko was originally a robot programmed to be a "Good-Friend Robot", which means she is a good friend to all and protective towards them. In the I Love Roboko chapter, Doraemon made some adjustments so that Roboko only likes and cares for Nobita. Due to the programming, Roboko became more attached to Nobita than how much she's supposed to be, and takes anyone else close to Nobita as a threat for his attention. Roboko has tremendous strength, which is highly problematic if she goes berserk.
Appearance in Games
Nobita and the Green Giant Legend DS
Roboko is one of the "Secret Base Items" in the game. It is can be crafted by collecting からクリナッツ(Chestnut), ?がたコンピューター(? Computer) and ナゾの?かい (? or Mystery).