Yaffu

Yaffu (ヤッフー), also known as S-R300, is a giant fan robot used to create wind for films. They only appear in the beginning of Wily Stage 3 in Mega Man 6, and they generate wind to pull or push Mega Man, which can be dangerous as the area has spikes. The arrow on them shows the direction of the wind, and Mega Man can use this to his advantage to jump over spikes.

Etymology

 * Its name is probably a combination of Japanese words, "yajirushi" (矢印, arrow symbol) and "hū" (風, wind).