Shaball

Shaball (シャボール) is a rolling ball enemy that appears in the first stage of Mega Man Zero 2, "Desert Wilderness", and Fighting Fefnir's second stage in Neo Arcadia, "Temple of Flame". Occasionally it stops and opens itself to shoot out arcing shots.

Trivia
Its name may be derived from cactus (サボテン saboten, also written as シャボテン shaboten) and ball (ボール bōru).