Mangle was first introduced in "IF FOXY WAS THE PHONE GUY 2", only making a small cameo on the night 3 phone call in the background, but they sounded like a male than her female voice now. This old Mangle voice almost made Eth not release the video.
Like the other toy animatronics, She was released after the original quintet of haunted robots. She may possibly be related to Foxy and close friends with BB.
Overtime, Mangle started to play more games and gained her voice and personality she now has today.
*Mangle actually had two voice changes. In her second appearance when she played night 6 of FNaF 1, it’s voice almost sounded both male and female.
*In almost every thumbnail Mangle is present in, her second Endo head is too, but her second head never speaks. This may because it is just a fake head.
Mangle was a victim of the Fazbear Massacre and became a phantom. Thus, she fell under Springtrap's control and worked to kill the remaining Fazbear residents.
“La la la la la la I like to Dab Dabaw Dab Dab adoon dow Dab Dabaw Dab Dab adoo AHOY MATEYs”
Mangle and Foxy say “Night 2“ whenever you start the said night on Five Nights at Eth’s by IndigoGamer000.
Mangle played Episode 3 of Minecraft Story Mode, FNAF World, Super FNAF, Diep.io, Happy Wheels, Sonic Mania, and Five Nights at Candy’s. Since her last Let’s Play on Sonic Mania back in September 17, 2017, she didn’t do another one since then.