Vision (Marvel)

Vision is a superhero from Marvel comics most often associated with the Avengers, originally built as a weapon by Ultron to use against the heroes Vision became self-aware and decided to cast aside his old master in favor of being a hero instead and has remained, more or less, a loyal member of the Avengers ever since. Vision is a synthetic being similiar to a robot or android but is fully sentient, being capable of understanding and even feeling human emotions.