Also known as: きもけーね, キモけーね, 카미시라사와케이네(백택)
The Hakutaku form of Kamishirasawa Keine.
The nickname comes from the fact that Keine is the Extra Stage mid-boss (or "EX mid-boss" for short) of Imperishable Night in this form.
As a joke, fans commonly say "Caved (Touhou) by Ex-Keine."