Asterix's Obelix: "These Romans are crazy! (Ils sont fou ces romains!)", frequently adjusted to complain about whichever nationality is being parodied in this particular issue. (Oddly, this phrase is spoken by Asterix on the inside cover of the French hardbound editions).
In Grant Morrison stories his catch ... noise is "-hh-". This sigh can represent impatience with his allies' methods, irritation that they're second-guessing him or trying to get him to socialise, or even grudging respect. He also uses it where other people might laugh. Similarly, Damian Wayne has "-tt-", usually directed at Dick Grayson.
When Harley Quinn is introduced by her full name Harleen Quinzell, she'll often offer this phrase.
Harley: Call me Harley. Everyone does.
Blue Beetle Ted Kord's trademark laugh - "Bwahaha!" - is so recognisable that it definitely qualifies as a catchphrase.
(when swimming in money) I like to dive around in it like a porpoise! And burrow through it like a gopher! And toss it up and let it hit me on the head!
(when he thinks hes lost all of his money) Im only a poor old man!
Theres also a standard narration caption that appears near the end of many Scrooge adventures: So Uncle Scrooge gets all of his money back, and things are again as they were!
Scrooge, on how he made his money: I made it by being tougher than the toughies and smarter than the smarties! And I made it square! This line was only used once by Carl Barks, but it was so memorable that other writers (e.g. Don Rosa) turned it into a catchphrase.
Daryl Zed, the eponymous character of a comic book inspired by Dylan Dog in the meta episode "Witch Hunt", uses exclamation "Jehoshaphat Jumper". The same exclamation is used by Dylan himself in an Alternate Reality Episode "The Dark Days".
The Thing of Fantastic Four has two: "It's clobberin' time" and "wotta revoltin' development".
And referring to himself as "the ever-lovin' blue-eyed Thing" and "the idol o' millions."
Then there's his oft-mentioned "sweet Aunt Petunia" (no connection to the other, considerably un-sweet Aunt Petunia). She eventually appeared in person, and in defiance of expecations it turns out she's an attractive young woman. Presumably there's some big age-gaps in the Grimm family...
Actually, it's established that Petunia was Ben's aunt by marriage, and that her husband, Ben's uncle, was several years older.
The Green Lantern mythos has these coming out the wazoo. There's nine different Lantern Corps, each with their own Oath (Though Orange and White haven't had theirs revealed and Indigo's is gibberish).
The unofficial catchphrase of the Blue Lantern Corps is "All will be well", following the example of their leader, Saint Walker.
Likewise, the unofficial Orange Lantern catchphrase is "Mine".
Whenever a new Lantern is selected the rings have their own little catchphrase: "[New Lantern] of [Native Planet], [reference to their capacity to engender the emotion the Corps is based on]. Welcome to the [Color] Lantern Corps."
Hal Jordan of Earth, you have the ability to overcome great fear. Welcome to the Green Lantern Corps.
On one occasion, as his smarter and more-amoral "Joe Fixit" persona:
"Rest assured, gentlemen—Hulk will smash."
Iznogoud: "I want to be Caliph instead of the Caliph!" This has even become a common phrase in France to refer to someone who is overly ambitious. Iznogoud would occasionally turn this into a Mad Libs Catch Phrase; for example, in "The Giants' Island", when he and Wa'at Alahf become, respectively, a bishop and a knight in a game of Human Chess, the vizier grumbles that he wants to be king instead of the king.
His sometime associate Misty Knight, in her position as the current coordinator of the Heroes for Hire, now has "Hello, hero. This is Control. Are you for hire?" This has already seen a number of variations in the still-new series, usually courtesy of Paladin. "Answer me this, hero: are you for hire?"
Metal Men: : Mercury would like to remind you he's "the only metal that's liquid at room temperature!" (He's not.)
Nexus would occasionally say, "This calls for hyper-speed!" The first time he said it, the comic's letters page had readers complaining it was corny, and Mike Baron had to point out it was supposed to be a joke.
Mezz and his band frequently said "Vootie!" and "Klacktoveedesteen".
"It is imperative that you pay attention at this time..."
In Peanuts, Charlie Brown has "Good grief!", "Rats!", and "I can't stand it... I just can't stand it!" Lucy has her "Augh! I've been kissed by a dog! I have dog germs!" rant.
Reverend Jeremiah Hatch from The Question lamentably laments your lamentable lamentation.
Parodied in Runaways. Victor believes the group should have a catchphrase and begins spouting out all the Marvel character's famous lines. Niko informs him that their catchphrase is "Try Not to Die."
They also have "Runaways, run away!"
Sam & Max: Freelance Police: Sam often says to Max "You crack me up, little buddy." This is changed around a lot though, usually changing parts with "You bust me up, little pal.", though in a western themed strip it became "You crack me up, ya mangy yella tailed varmint."
Also: "Where do you keep that (Noun), Max?" "None of your damn business."
Sam's "Can't think of a reason not to..." after Max asks to bust up the place.
Captain Marvel: "Holy Moley!" "Doggone!" and of course, "Shazam!"
Dr. Sivana (pre-Crisis, when he was still a funny villain instead of a creepy one) would gleefully soliloquize about how he was "the most evil little wretch the world has ever known!" followed by his trademark laugh, "Heh! Heh! Heh!" "You big red cheese" (which means he's smelly like a fart, as in "cutting the cheese").
Jack Point from The Simping Detective has one that comes in two parts. There would always be one person in ever story would end up asking Jack, "What's your point?" to which he'd always respond, "Comes right after the 'Jack.'" After this, something totally awesome would always end up happening.
In the Sin City series, if Marv ever says to you, "Now that there is one damn fine coat you're wearing," you're going to get said coat taken from you, along with any parts you have.
"With great power comes great responsibility", That's the catchphrase of old Uncle Ben... If you missed it, don't worry, they'll say the line, Again and again and again! - "Weird Al" Yankovic, "Ode to a Superhero"
Not really official, but he has used the phrase "it's web-slingin' time" more than once.
"The old Parker Luck."
During his second stint as the Green Goblin, Harry Osborne had the catchphrase "Gotcha!", used when Spidey realised he was behind a given plot (Harry's main motivation in this period being simply to mess with Peter's head).
Mary Jane: "Face it tiger, you just hit the jackpot!"
The Daily Bugle: "Spider-Man: Threat Or Menace?"
Aunt May: "That awful Spider-Man!"
Flash Thompson, back when he was a jerk jock: "Hey, Puny Parker!"
Superlopez's "Cachis la Mar!" (a family friendly "Holy shit/crap!")
"Un café con leche y un croissant"("One latte and one croissant"), "Un billete para el Masnou, ida y vuelta" ("A return ticket to the Masnou"). See Running Gag below.
Inspector Holmez has three: "Hmmm... sospechoso, sospechoso..." ("Hmmm... suspicious, suspicious..."), "¡Todo el cuartelillo a los coches!" ("Everyone in the barracks, get into the cars!"), and his habit of asking anyone in sight for peanuts (even though he has never actually been seen eating any).
Luisa's "¡Que te doy un bolsazo!" ("I'll hit you with my bag!") and "¡Medianía!" ("You Mr. Ordinary Guy!").
Superman: This looks like a job for...note This and many other familiar catchphrases are from the radio show.
"Up, Up and Away!"
Clark used to say "Great Scott!" He may have been starting to say "Great Krypton" and then covering up for himself, or perhaps this is something Pa Kent used to say.
And, very occasionally, "Craters of Wegthor!" (Wegthor was one of Krypton's moons. This phrase never caught on. Can't imagine why...)
Perry White: "Great Caesar's ghost!" and "Don't call me chief!"
Tintin's Captain Haddock: "Billions of (blue) blistering barnacles!" and "(Thousands of) thundering typhoons!"
The Mighty Thor had a few oft-repeated (if not overused) catchphrases back in the Silver Age, including calling Thor - and tons of other people - "a warrior born." "So say we all" also got repeated use as a semi-formal response from groups of Asgardians.
Brösel: And I said, "Werner, don't do that!" But HE doesn't listen.
Wonder Woman, in the old days, would say "Suffering Sappho!" This was writer Charles Moulton's tongue-in-cheek Take That! to Moral Guardians who claimed she was secretly a lesbian, and it fell out of use when Moulton left the book. She had about a half dozen similar exclamations that lasted her throughout the Silver Age, though, including "Great Hera!", "Thunderbolts of Jove!", "Neptune's Trident!", and "Shades of Pluto!" Nowadays she is more likely to say "Great Hera!" or "Holy Hera!"
Her original sidekick Etta had "Woo woo!", though at times this approached a Verbal Tic
Nightcrawler: "Ungaublich!" (German for "That's incredible!")
Xadhoom may had transformed herself in a Physical God and spent every minute of each day from then to avenge her race,but she never forgot when she was simply Xado,a scientist that loved dancing. Her battlecry is :"Let's dance!".