Courage is, of course, everyone's favorite cowardly dog from the show. After months of being unwell, he finds out that the illness afflicting him is fatal and that Muriel has plans to have him put down to keep him from suffering.
With Computer's help, the two of them set off to find a mountain that just might hold the means of curing his seemingly incurable illness. Despite his immense fear of dying, he remains the more optimistic of the two, something that tends to draw the ire of Computer on a constant basis. Though friendly and forever loyal to those he considers his friends, he's not without his faults. It's a terrible mistake that he makes which causes Computer to have to confront some of his own worst demons.
- Action Pet
- Afraid of Doctors: He's afraid of veterinarians in general and with good reason too!
- All Men Are Perverts: In a shout out to the scene from the show, he runs into the exact same thing with the woman screaming at him in the shower.
- Big Eater: He's seen practically inhaling hamburgers at one point. Although it turns out he doesn't hold a candle to Computer after he gets over his dislike of eating.
- Civilized Animal: While he's slightly more animalistic than some of the other fully humanoid animals they come across, he's as smart as any human and tends to do everything the way a human would.
- Chronic Hero Syndrome: He will always try to do the right thing regardless of how much trouble it might cause him.
- Deadpan Snarker: Not as bad as Computer, but he does have his moments.
- Determinator: As always, but it's especially noticeable when it comes to helping Computer with his own problems. He never gives up no matter how many times Computer might try to push him away.
- Friend to All Living Things: It's often noted how easy it is for him to make friends with even the most unlikely people.
- Loyal Animal Companion: To anyone he considers his family.
- Lovable Coward: As always.
- Parental Abandonment: The loss of his parents comes up several times in the story. It can also be noted that the intense fear he has of his life changing probably stems from this along with his already established fear of losing his family.
- Speech-Impaired Animal: The story meets halfway with the show on his ability to talk. He can speak English for the most part, but he often defaults to his babbling dog-speech, especially when he's scared. It's said that Computer has just gotten very good at understanding his speech patterns and for everyone else it fluctuates if they can understand him or not.
- Supporting Protagonist: While the story is about curing his illness, Computer starts to become the central character after awhile when his own Character Development starts to take focus and that leaves Courage in more of a support role. The best way to describe it is that Courage and Computer are the protagonists.
- Talking Animal: Outside of Computer and a few other characters, most people ignore him or don't know what he's saying.
- Undying Loyalty: To Muriel, of course, and also to Computer after the two of them develop a close friendship.
- The Unintelligible: Almost completely averted. Courage speaks normally in this story, though he sometimes reverts back to his babbling 'dog speech' at times.
- Wide-Eyed Idealist: He tries to never give up on anyone or anything and he has all the loving innocence and loyalty of any dog.
Sharing the role main character, Courage's ever witty and snide Computer takes control of the body of another dog to help get Courage to the mountain that may cure him of his illness. Having suffered many slights both big and small throughout his life, it's largely the cause of his Mean Brit nature.
Both a bad call on his part and Courage making a terrible mistake of his own at very bad time causes him to have to come to terms with his past and everything that had happened to him. He begins working towards being a nicer person after a close friendship develops between him and Courage, but his often cynical nature and snarky attitude still tends to shine through at times.
- Adorkable: He has his moments.
- Big Eater: As of chapter 112, he finally gets over his hatred of eating. Unfortunately, he goes and empties a whole refrigerator in one go and gets voraciously sick because of it...
- Bizarre Taste in Food: Not only does he get over his hatred of eating but he immediately gains a weird taste in food as well. He likes adding ketchup to ice cream and prefers to add 'strange' ingredients to sandwiches.
- Butt-Monkey: Poor Computer seems to be the universe's personal Butt-Monkey. It leads to him being on the receiving end of a lot of slapstick humor and a LOT of Tear Jerker moments. It gets so bad that at one point he starts to convince himself that he's really bad luck incarnate.
- Cynical Mentor: It's shown in a prequel story that he was the one who taught Courage how to read, speak, and type like a human.
- Driven to Suicide: After being rendered near useless as a computer thanks to the hacking and reprogramming he endured, he had all but given up. He went on to find a new purpose in life as both a mentor and helper to Courage after he was given to the Bagg family.
- And he's nearly driven to suicide again in the Dreamworld when the tar creature manages to convince him that Courage doesn't want him anymore.
- Deadpan Snarker
- Guilt Complex: He blames himself for the death of one of his owners and it doesn't help at all that he was Mind Raped to feel even more guilty about than he already had.
- Good Is Not Nice: Although he has shades of this in Volume I, Volume II cranks it up to eleven, as his methods of fighting back in 'self-defense' or protecting Courage, often... Go too far. Also, he can still often get proud, sarcastic and cynical to no end.
- Hates Being Alone: Becomes an important point during the Dreamworld. Having been tossed out by so many of his owners, he hates being abandoned more than anything, even if he doesn't want to outright admit it. Believing that Courage had abandoned him too, just like everybody else, while they were in the Dreamworld nearly drove him to suicide with only a little prodding from the tar creature.
- Hypocrite: For all the trouble he gives Courage over being 'stupid', he himself is prone to doing some incredibly stupid things. A large part of the story is about showing that he isn't as infallible as he likes to think and how his headstrong 'I can do no wrong' nature tends to do more harm than good. He likes to rush into things without thinking first and it often comes back to bite him many times during the story.
- Inferiority Superiority Complex: Acts like he's better than everyone else while inside he's completely convinced that he's a worthless piece of garbage due to the hacking that nearly destroyed him.
- Jerk with a Heart of Gold: He means well, especially when it comes to Courage, but it's just that after how badly his previous owners had treated him that he's not all that inclined to be nice.
- Leeroy Jenkins: He has a bad habit of thinking that he can handle anything and it often gets him and Courage into trouble when he goes running into danger. He eventually acknowledges this failing but even into Volume II he still tends to attract unwanted attention with his rash actions.
- Only Sane Man: He likes to think this but it's pretty far from the truth.
- Nervous Wreck: He has shades of this at times. Sometimes it's Played for Laughs, sometimes it is not. It becomes especially prominent between chapters 83 to 89.
- Never My Fault: Slowly gets over this as the story progresses.
- Not So Stoic: While it's never called out by name, he seems to be suffering from PTSD to some extent, thanks to the various levels of abuse he went through before he met Courage. He has horrific nightmares, is prone to getting 'caught up' in his memories if he thinks about them too much, is prone to angry outbursts if anyone tries to bring up his past, tries to avoid thinking about or feeling any emotions that pertain to what he went through, and had for a very long time been trying to forget about what happened. To make matters worse, he's so desperate to hide his Hidden Heart of Gold that he prefers to pretend that nothing is wrong and thus it makes the symptoms all that much worse.
- It does go in the other direction too. He's seen to be a lot more 'open' and less stoic as he befriends Courage. He's not above goofing off or having unintentionally Adorkable moments. He tends to panic to a ridiculous and over the top degree if he can't figure something out and he's prone to making a big deal out of seemingly mundane things.
- Sanity Slippage: Though he does steadily become a much nicer person as things go on, he also loses his tolerance for all the weird things that happen all around him. This leads to some pretty crazy mental breakdowns on his part.
- Sour Outside, Sad Inside
- Stepford Snarker
- Talking Appliance Sidekick
- The Insomniac: He hate sleeping because of the horrific nightmares he suffers from.
- The Klutz: He's prone to being a bit clumsy at times due to the fact that he's controlling the dog body and isn't actually the dog itself.
- The Mean Brit: As always.
- My Greatest Failure: Despite trying to pretend otherwise, he blames himself for not waking up his old owner before he was shot to death.
- Trademark Favorite Food: Coffee.
- Tsundere: Becomes this in spades, if him staying by Courage's side after he was knocked out for 5 days, and then denying it to him is any indication. Type A, obviously.
- Perpetual Frowner: He's rarely caught smiling in his dog body.
- Although he does seem to be getting better, at least towards the end of Volume I and into Volume II.
- Took a Level in Kindness: He makes a conscious effort to try and be nicer to Courage but it hasn't worked out very well yet.
NinaAn anthropomorphic ferret (Similar in body type to Katz, Bunny, and Kitty.) who tries to take Computer in as her pet after he and Courage have another falling out. Although he doesn't become her pet, they do become friends. She has an obsession with the supernatural and with Courage's life being a goldmine of supernatural activity, she naturally wants to learn more. She strikes an odd balance between being somewhat hyperactive and surprisingly mature. She helps her dad run the motel that Courage and Computer stay at and while they are there she more or less becomes apart of their 'group'.
- Nightmare Fetishist: She is absolutely obsessed with the supernatural. Her entire room is filled to the brim with posters, books, action figures, comics, and much more about famous creatures like Bigfoot and Nessy.
- Cloudcuckoolander: She has shades of this.
'Him'A cruel scientist who stole Computer in hopes of using him to create his own Artificial Intelligence. He killed Computer's owner at the time and hacked into him to both gain control over him and figure out how he works. He took sadistic glee in causing him pain and spent a great deal of time messing with his head. He ultimately killed Computer several times only to resurrect him from a backup and would begin the process of torturing him all over again. Eventually he was caught for the murder he committed and supposedly died in jail, but Computer believes that he is still out there somewhere.
- For the Evulz: He continued to psychologically torment and torture Computer long after it became clear that he wouldn't be able to make a new A.I from him.
- No Name Given: Computer knows his name but 'He' had his programming modified so that he can neither speak it nor spell it. The cruel scientist felt that a 'lesser being' shouldn't be allowed to address him by name.
Computer's Old OwnerComputer's previous owner before 'Him'. He was, in Computer's words, the only one outside of Courage who'd ever truly been kind to him. He had a bumbling, forgetful personality, but he had treated Computer as an equal. Unfortunately, after refusing a deal from 'Him', he was killed by a gunshot, leaving Computer at 'His' hands.
- The Klutz: He seems to have had a bumbling personality, annoying Computer to no end.
- Nice Guy: He was the only owner Computer had outside of Courage, who had actually talked to him as a person. And he had refused a large sum of money from 'Him', for the sake of Computer.
- Posthumous Character: He had been long gone, killed by 'Him' way before the main story began.
- No Name Given: He fits this trope for a while, as Computer is unable to remember his name: It's later revealed to be Owen.
A strange being who dwells within the Dreamworld. It seemed at first that he was just another part of Courage's or Computer's mind, but he started to show that he was independent of both of them and knows way more about the Dreamworld than anyone else. He's implied to have been the one who created the rings that are used to access the Dreamworld but apparently got himself stuck there forever and is now bound to help anyone who stumble into the realm.
- Crazy Homeless People: He likes to play up his homeless persona when he's not being serious.
- Obfuscating Stupidity: He knows way more than what he's letting on.
- No Name Given: Seems to be a running theme with many of the characters in this story and he's no exception.
- Mysterious Past: He claims that he's a man who got trapped in the collective unconscious trying to obtain immortality. That's all the information that's given about him, aside from the fact that he's probably the creator of the rings used to access the Dreamworld.