Charlie is one of the major characters from The Brave Little Toaster to the Rescue.
Charlie is a computer genius. After Rob started having problems with his computer, he and his girlfriend, Chris called Charlie to see if he could help them fix it. He tried his best, but it was no use, it had the same error: NO FILE EXISTS. He told Rob that there might be some computer virus. Two days later, he, Rob, and Chris go to the basement and notice that the problem was from Wittgenstein, whom was already fixed. Then, they thought he would make a great exhibit in the Science Museum, so they moved him there.