:::With what we know, we simply cannot state that Rat Man is Doug Ratmann because of WP:SYNTH. Evidence points that way, but there are scenarios where it could be a completely different person. Who is it to say that "Doug" (the person with the schizo drugs) is Doug Ratmann where there could be 100s of Dougs in the massive ApSci facility? Yes, by Occum's razor, its pretty clear that the simplest explanation is that the Rat Man character in the comic is Doug Ratmann from the old website, but we cannot make that connection without injecting original research.  If someone else - Valve or a reliable gaming source - puts forward this, then yes, but also consider that the only mention of the character within Portal 2 the game is as the Rat Man, and so this should be the name used.