Rolleroid

Rolleroid (ローラーロイド) is a Reploid from Mega Man X8 equipped with tread-feet that appears in one room in Gravity Antonion's stage, Primrose. They can safely move on spikes and shoot projectiles in three directions that bounce off walls. Axl can copy their DNA to transform into a Rolleroid, granting him their attack and immunity to spikes.