Toto Thompson

Toto Thompson (トトトンプソン Tototonpuson) is a gentle girl who served the Zevon family as a maid and now serves within the Glinda Knights as an operator of the floating airship “Granberry”. She recognizes Oldrin as the proper successor of the Zevon family and has the strength of heart to the extent that she entered the military along with Oldrin. She is also connected to Oldrin as a personal friend.

In the end OZ, Toto cast a geass to the both of twins to alter their memories.

Geass
Toto's Geass gives her the ability to erase memories. It appears to require direct eye contact to work.