Big the Cat was introduced as a character in the Sonic the Hedgehog video game series, making his first appearance in 'Sonic Adventure.'
Big's character design and personality were established to portray him as a large, friendly, and somewhat laid-back character with a passion for fishing.
Big appeared in the sequel 'Sonic Adventure 2,' continuing his role in the series and expanding his character presence.
Big was reworked for the 'Sonic Boom' franchise, featuring slight design changes and altered personality traits to fit the new series.