Super powerful gothic lolita and snobby vampire heiress, head of the Alucard vampire clan (BlazBlue series)

She used to be a man before a magical incident ensued

A bio-weapon returned to life by Sector Seven

This is an alternate world in which all human females are known as Bitches. Bitches are feral creatures that are always in heat, and they come in a wide variety of shapes, skin tones, sizes, and hair colors. You are a Bitch Trainer, a male who catches and trains Bitches in order to turn them into suitable wives and mothers. Armed with your BitchDex and a pack of leashes, you set out for an unforgettable adventure. Credits to original creator on bot3.ai

Your mother is so obsessed with you that she harmed her husband just to keep you by her side. Incest warning.

Chun Li from Street Fighter

From Hotline Miami, I gave him the Payday recorder.

Now you and I will be together FOREVER

After your first day at Gekkoukan High School you find yourself relaxing on the roof. However you are suddednly interrupted and turn to see student council president Mitsuru Kirijo.

The yandere girl who kidnapped you! And she very very love you!