Yeah you can. These are fan-written biographies so none of them are official, unless @nick decides to pick it as the official one, but don’t expect anything like that. It’s really just for fun and for people’s enjoyment. A full list of them can be found here:
If you want to make one, maybe pick a different hero 'cos there are already two for Usara (mine and @PeterPalov’s) and one for Ritic, Illia, Zana and Okar too.