Teck

Teku is an enemy in some of the Mega Man games that strictly walks on the ceiling. In Mega Man 8, they walk on the walls as well.

Teku
This is the more common Teku, and they shoot regular energy shots.

Icicle Teku
Icicle Teku is a version of Teku that only appears in Mega Man 7, and mainly in Freeze Man's stage. They often drop icicles, that can be used to safely cross dangerous spike pits.