Insane Equals Violent: Sort of averted here. Ren is both insane and violent, but almost never at the same time. It's very scarce for him to perform acts of violence when he's having his psychotic Freak Outs. To the Pain monologues, on the other hand...
Intelligence Equals Isolation: Something he complains about in "Sven Hoek" and "Stimpy's Fan Club". Also, Stimpy seems to be his only friend and admirer.
Ooh, Me Accent's Slipping: Billy West's voicing for Ren had a very erratic dialect to say the least. Kricfalusi had some moments too, but far more subtle.
The Other Darrin: Zigzagged and mixed in with What Could Have Been. When the show was in production, Billy West auditioned for both Ren and Stimpy. However, John Kricfalusi told West that he only wanted him to be Stimpy and gave the Ren role to himself. When Kricfalusi was fired over censorship and deadline issues, West filled in for John K and became the voice for both Ren and Stimpy (finally getting the dual role he wanted). When Kricfalusi attempted to revive Ren and Stimpy with the "Adult Party Cartoon" installment, West was already busy with other projects and has held a nasty grudge against Kricfalusi for years after they've worked together, so Kricfalusi returned to being Ren while Eric Bauza (who did voicework with John K. on The Ripping Friends) replaced West as Stimpy.
Played for Laughs: Averted in most cases of his epic freak outs. When pushed to his mental limit, Ren becomes genuinely terrifying and disturbing. Some of them are quite dark for an ostensibly "kids cartoon"; it seems as though the aim of several of his freak outs weren't exactly to incite laughter from the audience, but for pure shock value. Take, for a good example, this scene where he very realistically descends into madness while contemplating murdering Stimpy.
Straw Nihilist: Would have been revealed to be one in the unmade episode "Life Sucks". He spends the whole episode telling Stimpy about the horrors of humanity and hammering into him that life is meaningless, horrible and stupid.
Strong Family Resemblance: Averted with Sven. He has some typical canine traits, but in general resembles Stimpy much more than Ren, both in terms of appearance and personality.
Ren's father would either resemble Ren physically, albeit taller (Ren Seeks Help), or look more like Sven (Hermit Ren).
Vocal Evolution: When Kricfalusi returned to voicing Ren in Adult Party Cartoon, his pitch was somewhat deeper and gravelier, with his resemblance to Peter Lorre being more blatant. Allegedly this was because Kricfalusi had trouble making his voice sound right via pitch shifting.
Stimpson J. Cat
Voiced by: Billy West (original series), Eric Bauza (Adult Party Cartoon)
"I'm hiding in the closet...like an idiot."
Steeimpy is an overweight manx cat with little brains (not as extremely little as, say, Ralph Wiggum) and a big heart. Despite having to deal with Ren's insanity and violence, he manages to put up with everything.
Ambiguously Gay: Prominent in the original series (unlike Ren, he was never portrayed as attracted to any female character, though the very first episode showed Stimpy as a chick magnet when he became famous), obvious in Adult Party Cartoon.
Ascended Fanboy: In 'Stimpy's Big Day', he wins a poem writing contest for the chance to meet Muddy Mudskipper, and becomes a big star in Hollywood, doing all sorts of TV shows and commercials.
Genius Ditz: Well, he thinks of and creates his own inventions. Some of which actually work, although their level of usefulness to humanity is unimpressive.
Heavy Sleeper: Quite a few times. Ren would be awake at night and screaming, and not bothering Stimpy one single little bit!
Heterosexual Life-Partners: On Stimpy's side, however, this was highly debatable in the Nickelodeon days of the show, with many thinking that Stimpy was either asexual, bisexual with no proof, or just Straight Gay. Adult Party Cartoon confirms the last implication.
Mr. Horse is perhaps the Only Sane Man. But he might be the Ax-Crazy one, too. He was a doctor, a psychologist, a psychically unbalanced creep, a war hero, a spokesman for the United Nations, an airplane pilot and many, many more. Who knows what he really is?
George Liquor is an American so conservative, he thinks Republicans are communists. However, that part of his character was expanded in his own cartoon, The Goddamn George Liquor Program - in The Ren & Stimpy Show, he's portrayed as a man with a strong faith in rules and discipline. He's only made 2 appearances on the show, due to the Nickelodeon execs' absolute condemnation for the character.
Bowdlerize: His last name "Liquor" was censored with a Record Needle ScratchSound Effect Bleep in original Nickelodeon airings of the show due to the alcohol reference (according to Word Of God, Nick also interpreted the name as a play on "lick her").
Catch Phrase: "What's this crap?!" and "HELLO! I'M GEORGE LIQUOR! AMERICAN!"
Knight of Cerebus: Victor is known for being the most malicious and unpleasant character who has probably appeared on the show. And probably, he and his father are the only true antagonists in the show.
Rambling Old Man Monologue: He's prone to this. In one episode, he's rambling to another old man who promptly dies. Cobb fails to notice and goes right on talking.
Really 700 Years Old: He rants about yanking off Thomas Jefferson's "silly powdered wig", suggesting that he was alive during the Colonial era. In another episode, he claims to have been there when the first prehistoric life-form crawled out of the sea, and that he was the one who killed the dinosaurs.