GaoLion is the beating heart of the entire Gaoranger mecha roster: the majestic red lion with the golden mane, totem Power Animal of GaoRed (Kakeru Shishi) in Hyakujuu Sentai Gaoranger and the Red Lion Wildzord of Cole Evans in Power Rangers Wild Force. As king of the 1,000 Power Animals, GaoLion is the flagship of the team – the Rangers' first ally and the beast that sets the tone for the whole "living-fossil-meets-nature-spirit" aesthetic of the show.

Its defining role is as the core of the standard combination GaoKing: GaoLion forms the upper body/torso, GaoEagle mounts on as the head and chest armor, GaoShark and GaoTiger become the arms, and GaoBison forms the legs. No other Power Animal sees more action. On top of that, an enlarged GaoLion transforms into the horse-like lower body and mount of the centaur-shaped mega-combination GaoKentaurus – a striking contrast in which the same lion serves once as the trunk of a humanoid robot and once as a galloping steed.

On the toy side, GaoLion exists in two flavors. The regular GaoLion came in Bandai Japan's DX GaoKing set (March 2001), which bundled GaoLion, GaoEagle, GaoShark, GaoTiger and GaoBison plus an emblem base and – as was standard for DX mecha of the era – carried die-cast content for satisfying heft. Later, a noticeably larger stand-alone release, "Power Animal Series 9: DX GaoLion" (December 2001), added its own gimmicks – including shoulder-launched missiles – and, above all, enabled the GaoKentaurus build. Bandai America issued the same lion for Power Rangers Wild Force as the Red Lion Wildzord, usually as part of the Deluxe Wild Force Megazord, with the higher plastic content and distinct paint typical of the US line.

For collectors, GaoLion is doubly appealing: the indispensable base piece of every GaoKing configuration – including the arm-swap variants with other Power Animals (GaoKing Sword & Spear, GaoKing Striker and more) up through the larger builds – and at the same time the iconic solo beast that still defines the Gaoranger brand today.