Characters: Rocko's Modern Life
- All There in the Manual: His last name, from the book "Not Just Cartoons: Nicktoons!" is Rama. (as in, Rock-o Rama. Get it?) This is not mentioned anywhere in the series (due to the staff not reaching a consensus, he was left without one proper during the show), similar to the protagonist of another show.
- Australian Accent: Despite his voice actor not being Australian.
- Badass Adorable
- Beware the Nice Ones: Occasionally. He has completely destroyed a motorcycle because of bagpipe music once.
- Butt Monkey
- Comically Serious: At times.
- Deadpan Snarker: At times he can be one. Particularly when he's annoyed.
- Depending on the Writer/ Multiple-Choice Past: He either grew up in O-Town or emigrated there from Australia as an adult. The latter is said to be the true backstory of Rocko's life, but the former does crop up from time to time, causing a Continuity Snarl.
- Hair-Trigger Temper: Subverted, but he does tend to snap a LOT when he's in a bad mood.
- The Hero: Sometimes The Smart Guy.
- I Am Not Weasel: He's not a beaver, he's a wallaby.
- The Kirk
- Mad Libs Catchphrase: "____day is a very dangerous day..."
- Nice Guy
- One of Us: Worked at comic book stores (Super-Lot-O-Comics, headed by Mr. Dupette before he moved to Conglomo and Kind-Of-A-Lot-O-Comics, headed by Mr. Smitty), and loved it there (despite putting up with two terrible bosses).
- Only Sane Man
- Sick Episode: He gets a bad case of the flu...
- Took a Level in Jerkass: In the episode "Power Trip", where he becomes a Bad Boss to Filburt. Luckily, he has a My God, What Have I Done? moment when Really Really Big Man gives him a What the Hell, Hero? speech, and apologizes to Filburt.
- Unlucky Everydude: Emphasis on "unlucky".
- Babies Ever After: In yet another case of Getting Crap Past the Radar, Heffer seems to have fathered one of Filburt's kids.
- Big Eater
- Big Fun
- The Big Guy
- The Ditz
- Dysfunctional Family: His adoptive family is...interesting (George is kind of a jerk, Virginia is a Stepford Smiler, Cindy is the typical melodramatic teenage daughter, Peter is a high school dropout who may or may not be a homosexual, and Grandpa Wolfe is prejudiced against wallabies and beavers), to say the least. His biological family isn't as bad, but it's implied that Heffer's biological father didn't want him, his real mom was killed and made into a car seat in Illinois, and his stepmom is a sweet cow who's married to a Jerk Ass.
- Extreme Omnivore
- Fat Best Friend: Type A (confident and brash) , with some elements of Type C (airheaded)
- Fat Idiot
- Happily Adopted: As stated above, he's a steer that was adopted into a wolf family.
- Heroic BSOD: Happens to just about every character in the series, but Heffer suffers it especially bad when his dad bans him from going to anymore Weasel Scout functions. He gets better, though.
- Also when he learned he was adopted.
- Hidden Depths: He's actually skilled at Roller Skating in "Wallaby on Wheels".
- In spite of being such a slacker, he holds down several jobs throughout the series (paperboy, mailman, Christmas tree salesman, security guardnote , server in the Chameleon Bros.' coffee shop).
- I Am Not Weasel: He doesn't like it when people call him a "cow".
- Jerk with a Heart of Gold
- The McCoy
- The Millstone: Many of Rocko's problems are kick-started by something Heffer does, and even when he tries to help, he sometimes ends up screwing things up even worse.
- Raised by Wolves: Literally. The family did intend to eat him (his father even referred to him as "Steak" and passed off marking off the cuts of beef on his body as a "birthmark"), but they grew to love him.
- The Slacker
- Straw Loser
Voiced by: Doug Lawrence, Tom Kenny
- Ascended Extra: He started off as a Recurring Extra, but before Season 1 was over, he was fleshed out as Rocko's other best friend.
- Babies Ever After: With Dr. Hutchison.
- Beware the Nice Ones
- Catchphrase: "I'm nauseous", "Oh boy", "Oh fishsticks"
- Coming of Age: In the episode "Born to Spawn", Filburt is angsting about becoming an adult as he is forced to go to Kerplopitgoes Island (his birthplace) for a Rite of Passage. Which turns out to be a theme party in honor of The Seventies, where all the nerdy turtles become temporarily cool.
- A Date with Rosie Palms: Word of God says that the reason he wears glasses is because he "touched himself too much" when he was a kid.
- Early Installment Weirdness: In the early episodes like "Canned" and "Rocko's Happy Sack," Filburt was a generic character who wasn't established to be Rocko's friend. In "Canned," he was the customer who kept saying, "Turn the page, wash your hands..." and in "Rocko's Happy Sack," he was a cashier who almost charged Rocko's $150 for his groceries.
- Give Geeks a Chance: See Happily Married right below.
- Happily Married: To Dr. Hutchison.
- Hollywood Nerd
- I Was Quite a Looker: Word of God says he used to be handsome and athletic, but a case of unrequited love sent him into a downward spiral, which entailed a stay at a mental institution and culminated in his present Nerd status.
- Interspecies Romance: With Dr. Hutchison, much to the irritation of his family.
- Mistaken for Aliens: In the 'diary' episode, Heffer and Rocko find out that Filburt is an alien bend on taking over the world, but naturally it was just a misunderstanding from his novel called "Filburt's Secret Journal." or WAS IT?
- Nerd Glasses: Which get passed onto his sons.
- Removable Shell: Occasionally
- Shout-Out: To Woody Allen (just the neurotic, possibly Jewish nerd angle, not the "dating/marrying underaged Asian girls" angle).
- Shrinking Violet: Usually. When he becomes a lounge singer he manages to get past this mostly.
- Sickly Neurotic Geek
- The Smart Guy
- The Spock
- Straw Loser
- Turtle Power
- Why Do You Keep Changing Jobs?
- Younger Than They Look: He's 38 in "Future Schlock", but looks more like he's in his 80's or 90's. At the end of the episode, he looks like his normal self, suggesting he just hadn't been taking care of himself.
- Break the Cutie: "Old Fogey Froggy" showed he was actually a happy go-getter, but the same job and routine for 30 years sapped his will to live.
- Butt Monkey
- Can't Get Away with Nuthin'
- Catchphrase: "I hate my life"
- Cranky Neighbor
- Demoted to Extra: In-universe. When we first see him in Conglomo, he has enough clout to hire and fire Rocko. Later on, he's reporting directly to Mr. Dupette, who is now his boss. And even later on, in "Teed Off", he's described as the guy who "checks the bottlecaps on all of the bottles," being bossed around by one of the generic lizard workers!
- Foil: To Rocko.
- Grumpy Bear
- Hair-Trigger Temper
- Henpecked Husband
- I Have No Son: At first.
- I Was Quite a Looker: As seen in a Flashback from when he and Bev were first married some 30 years back.
- Jerk with a Heart of Gold: His reconciliation with his son Ralph earns him this, but only towards his son. Otherwise, he's a...
- Jerk With A Heartof Jerk: For example, think he was being generous when he offered Rocko a job? Two seconds later, he blows that sky high when it's revealed he only did so because the job was 'Test Subject' and it would have involved Rocko being mutilated or even killed.
- Unknown Rival: Rocko and friends are aware of what a jerk Ed can be, but they have no idea that Ed hates them so much that he has an entire team of scientists dedicated to disposing of them.
Dr. Paula Hutchison
Voiced by: Linda Wallem
Gladys The Hippo Lady
Really Really Big Man