When I tried to send friend requests to Char and SparkleMotion, this happened: It said Username can only contain alphanumeric characters, "_", ".", "-", and "+" Of course, the use actual letters, so it did not 'bypass' these requirenments. I do not know what happened, and would like to know if this happens to you.
It's because when you type in "char" or whatever and then click their profile, it puts in "Char" but with a space after it. Just delete that space. This probably wasn't intended Char