Tera

is a member of Konohagakure's ANBU sub-department, Root.

Background
He, like all members, are young orphans adopted into the organization and trained to lose emotions, in order to better accomplish missions. As the Root members each uses a codename, it is unknown what Tera's real name is, if he even has one. Even though the organization has been officially disbanded, Tera remains loyal to its head, Danzō.

Five Kage Summit arc
Tera has so far only been mentioned once by name, and has yet to make an actual appearance. He and Dajimu had both been secretly assigned by Danzō to assassinate Anko Mitarashi, but due to the village's current situations, their mission has been delayed in preference of tracking Kabuto Yakushi before she does.