Astérix'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.
Blue Beetle Ted Kord's trademark laugh - "Bwahaha!" - is so recognisable that it definitely qualifies as a catchphrase.
Parodied in the new Dr. Strange: The Oath miniseries with By the Hoary * &(^ing hosts!
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
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!"
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.
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.
"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"
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).
Not really official, but he has used the phrase "it's web-slingin' time" more than once.
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. She also said "Great Aphrodite" and "Merciful Minerva!" Nowadays she is more likely to say "Great Hera!" or "Holy Hera!"
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!".