Blitzkinder Academia: Xolani, energy syphon

Not all of the "students" at the academia are children. Dr. Peter Michael Cavendish, a psychologist, meets her whilst she still insists on being isolated. They strike up a friendship that quickly escalates despite the risk that her energy draining powers pose.

The children find this amusing since she is easily 3 times as tall -- because he's a dwarf and she's a giantess.

But in this picture, she's still very much a predator.