Okay, if you have been reading Sket Dance. There's this character named Switch, and the series has been focusing on his back story for a couple of chapters. See, Switch as we know was a regular teenager who had a nerdy little brother nicked named 'Switch'. He sent his little brother with a childhood friend because said child hood friend was getting stalked.
Unfortunately, The little brother was stabbed by the stalker, and died from the wounds. The older brother felt so much grief that he decides to become 'Switch', going so far to get a haircut, put on his glasses, and refuses to speak anymore, and instead uses a computer to 'speak' with its voice software.