Mecha is a series of alternate future/universe skins in League of Legends. Set in an alternate reality where Bandle City's most well known scientists, Heimerdinger Heimerdinger, Rumble Rumble, and Ziggs Ziggs have constructed giant mechas for the protection of their home against Kaiju monsters. Mecha officially encompasses two skin lines: Kaiju and Mecha.

Designated ATRX-1, the “Mecha Aatrox” unit was developed in response to 'gliding' kaiju with the capability of limited flight. In addition, ATRX-1 wields a thermal blade that can turn residual light particles into a heated cutting edge.