As you guys know (and if you don’t then I don’t think you follow me), I consider myself a Rattmann fan in the Portal fandom. You’ve probably seen my writings, maybe, and have seen me blog stuff about my pairings. I might not be the best writer out there, but over the years I’ve studied Doug Rattmann a lot from what little sources we have on him, and step by step have created up my picture of him.
Some people think Doug has heterochroma, but from my extensive looking at the comic I believe he has anisocoria instead. It’s possibly mistakable, since the enlarged pupil can make that eye seem darker than the other if the person has hazel eyes. Have some David Bowie for emphasis.
In my mind, however, the artist would have added a brown tint to the right eye if they truly wished it to be heterochroma. In the flashbacks to the less scruffy pre-incident Doug, he has brown tints to his hair. So there is a precedent. Following up on that, I believe his hair is dark brown tending to black. Doug would probably be in his twenties at the time of the takeover, old enough to be an employee in a science facility but young enough not to age too much from Pre to Post. I don’t think he was on the run for a year before Chell defeated GLaDOS. The hair and beard growth wouldn’t support that, though there are lines on his face you didn’t see before. They can easily be attributed to stress and being on the run.
If anything, Cube doesn’t in general fit with what I know about schizophrenia, since as far as I can tell the voices in one’s head are mocking and hateful. However, I don’t have enough personal experience, not having the disease or being a doctor. The only things I have to go off of are what my friends who have it tell me. From what I do know, though, it’s a terrible illness and often goes hand in hand with other problems such as depression. Doug probably had a lot of times while on the run where he considered suicide. One of the things I think kept him going was the desire to see GLaDOS defeated, as well as the need to protect Chell.
I’m sure Doug also had some guilt as the lone scientist survivor of the incident. This could have manifested as illusions of his former coworkers, or their voices in his head. Either way, he really is a tortured soul. The radio could help at times until the voices drowned it out. Then he’d probably turn to painting, sloppily attempting to push his hurt out onto the walls. No wonder his murals were so wild and random.
His diet consisted mostly of beans, from what I found in the dens in both games. In the first game there were milk cartons, which also suggested it wasn’t too long after the takeover since dairy products would sour and go bad. In Portal 2, however, I found water jugs amid the coffee cups.
I found a makeshift cooking unit with a pot in one of his Portal dens, which suggested that he had the technical knowledge to take apart a servo and rewire it to produce the necessary heat for the beans. He wouldn’t need a knife to open the bean cans since they seemed to have peel-able lids. In addition, it was obvious that he had some programming knowledge from the Portal ARG.
In any case, this all is just a lot of the physical and basic stuff about Doug that I’ve found and formed my headcanons about over the years. I’ll write more about this sometime later when I can get my brain in gear, but I’m currently running on about two hours of sleep.