The Birthday Massacre are a Canadian band that formed in 1999. As for genre, I would personally say they blur the lines between darkwave, synthpop, and industrial rock.
Throughout its long run and despite member changes, the band has maintained a remarkably consistent sound and image, most obviously visible in their signature purple color. The three core members that have remained the whole time are Chibi, Rainbow, and Falcore. At some point new members stopped adopting cool stage names unfortunately.
The music along with the album art evokes images of children wearing rabbit ears playing in the dead of night, with monsters in the shadows. Their music mixes creepy with cute and exists in a world of supernatural, innocent nightmares, where a song about ghosts and murder is a lullaby.