From Long Way to a Small, Angry Planet by Becky Chambers (pp.220-221)

“It’s a really old practice, goes back to pre-Collapse computer networks. We’re talking old tech here. People would choose names for themselves that they only used within a network. Sometimes that name became so much a part of who they were that even their friends out in the real world started using it. For some folks, those names became their whole identity. Their true identity, even. Now, modders, modders don’t care about anything as much as individual freedom. They say that nobody can define you but you. So when Bear gave himself a new arm, he didn’t do it because he didn’t like the body he was born in, but because he felt that new arm fit him better. Tweaking your body, it’s all about trying to make your physical self fit with who you are inside.”