Code name: Princess
Tohka Yatogami's name is given by Shidou the second time they met. Due to being a spirit, she is always being targeted by the AST and is aiming for the kill, because of that she hated humans for always shunning her and thinking that she wasn't allowed to live in this world, but her whole life changed when she met Shidou. Even with that high and cool presence, Tohka lacks some common sense and loves food very much.
Once her power is sealed, she wasn't being targeted by the AST anymore, and she started attending Shidou's high school. Her surname was given by Reine. She was overjoyed that she could live with Shidou now but knowing that Origami was there too she was somehow agitated and is always having a minor quarrel with Origami (mostly because of Shidou and their feelings).